Question: which opera had more acts? Le roi d'Ys or La favorite?

full_context: Document 1: La favorite: La Favorite (The Favourite, sometimes referred to by its Italian title: La favorita) is a grand opera in four acts by Gaetano Donizetti to a French-language libretto by Alphonse Royer and Gustave Vaëz, based on the play "Le comte de Comminges" by Baculard d'Arnaud. It premiered on December 2, 1840 at the Académie Royale de Musique (Salle Le Peletier) in Paris, France.
Document 2: The Legend (opera): The Legend is a one-act tragic opera composed by Joseph Carl Breil to an English libretto by Jacques Byrne. It premiered at the Metropolitan Opera in New York City on March 12, 1919 in a triple bill with two other one-act operas, John Hugo's "The Temple Dancer" and Charles Cadman's "Shanewis". Its melodramatic story is set in Muscovadia, a mythical country in the Balkans, and involves an impoverished nobleman turned bandit, his daughter Carmelita, and her lover Stephen, a captain in the hussars. The action unfolds over a single night at the end of which both lovers are dead—Stephen stabbed to death by Carmelita and Carmelita shot by Stephen's fellow hussars. The only one of Breil's six operas to be performed by a major opera company, "The Legend" received scathing press reviews and after its three performances at the Met disappeared from the repertory.
Document 3: La reine Fiammette: La reine Fiammette is an opera in four acts by composer Xavier Leroux. The opera uses a French language libretto by Catulle Mendès which is based on Mendès's 1898 work of the same name, a "conte dramatique" in six acts set in Renaissance Italy. The opera's premiere was given by the Opéra-Comique at the Salle Favart theatre in Paris on 23 December 1903. The production was directed by Albert Carré and conducted by André Messager. The United States premiere of the work was given at the Metropolitan Opera in New York City on 24 January 1919. That production was directed by Richard Ordynski, conducted by Pierre Monteux, and starred Geraldine Farrar as Orlanda, Hipolito Lazaro as Danièlo, Adamo Didur as Giorgio, Léon Rothier as César, and Flora Perini as Pantasilée. Up to the Second World War the opera received 59 performances at the Opéra-Comique.
Document 4: Padmâvatî: Padmâvatî is an opera in two acts by the French composer Albert Roussel. The libretto, by Louis Laloy, is based on Théodore-Marie Pavie's "La légende de Padmanî, reine de Tchitor", which retells the legend recounted in Malik Muhammad Jayasi's poem "Padmavat" (1540). It was first performed at the Paris Opéra on June 1, 1923. Roussel styled the work an opéra-ballet and there are many dance numbers and opportunities for spectacle. The composer was inspired by his visit to the ruined city of Chittor in Rajputana (now Rajasthan) and he incorporated many features of Indian music into the score.
Document 5: Jérusalem: Jérusalem is a grand opera in four acts by Giuseppe Verdi. The libretto was to be an adaptation and partial translation of the composer's original 1843 Italian opera, "I Lombardi alla prima crociata". It was the one opera which he regarded as the most suitable for being translated into French and, taking Eugène Scribe's advice, Verdi agreed that a French libretto was to be prepared by Alphonse Royer and Gustave Vaëz, who had written the libretto for Donizetti's most successful French opera, "La favorite". The opera received its premiere performance at the Salle Le Peletier in Paris on 26 November 1847. The maiden production was designed by Paul Lormier (costumes), Charles Séchan, Jules Diéterle and Édouard Desplechin (sets of Act I, Act II, scene 1, Act III scene 1, and Act IV), and Charles-Antoine Cambon and Joseph Thierry (sets for Act II, scene 2 and Act III, scene 2).
Document 6: Léandre et Héro: Léandre et Héro ("Leander and Hero") is an opera by the French composer the Marquis de Brassac, first performed at the Académie Royale de Musique (the Paris Opera) on 25 April (or the 5 May) 1750. It takes the form of a "tragédie en musique" in a prologue and five acts. The libretto, by Jean-Jacques Lefranc, Marquis de Pompignan, is based on the Greek legend of Hero and Leander.
Document 7: Le roi d'Ys: Le roi d'Ys ("The King of Ys") is an opera in three acts and five tableaux by the French composer Édouard Lalo, to a libretto by Édouard Blau, based on the old Breton legend of the drowned city of Ys. That city was, according to the legend, the capital of the kingdom of Cornouaille.
Document 8: Marino Faliero (opera): Rossini had influenced the management of the Théâtre-Italien to commission works by the outstanding Italian composers of the day—Donizetti and Vincenzo Bellini. Both wrote operas for that house in Paris, Bellini's contribution being the hugely-successful "I puritani". Donizetti's opera, which premiered on 12 March 1835 (a few months after "I puritani") was not nearly as much of a success. However, it marked Donizetti's first opera to have its premiere in Paris.
Document 9: Les pêcheurs de perles: Les pêcheurs de perles (The Pearl Fishers) is an opera in three acts by the French composer Georges Bizet, to a libretto by Eugène Cormon and Michel Carré. It was premiered on 30 September 1863 at the Théâtre Lyrique in Paris, and was given 18 performances in its initial run. Set in ancient times on the island of Ceylon (Sri Lanka), the opera tells the story of how two men's vow of eternal friendship is threatened by their love for the same woman, whose own dilemma is the conflict between secular love and her sacred oath as a priestess. The friendship duet "Au fond du temple saint ", generally known as "The Pearl Fishers Duet", is one of the best-known in Western opera.
Document 10: Opéra-Comique: The Opéra-Comique is a Parisian opera company, which was founded around 1714 by some of the popular theatres of the Parisian fairs. In 1762 the company was merged with, and for a time took the name of its chief rival the Comédie-Italienne at the Hôtel de Bourgogne, and was also called the Théâtre-Italien up to about 1793, when it again became most commonly known as the Opéra-Comique. Today the company's official name is Théâtre national de l'Opéra-Comique, and its theatre, with a capacity of around 1,248 seats, sometimes referred to as the Salle Favart (the third on this site), is located in Place Boïeldieu, in the 2nd arrondissement of Paris, not far from the Palais Garnier, one of the theatres of the Paris Opéra. The musicians and others associated with the Opéra-Comique have made important contributions to operatic history and tradition in France, and to French opera. Its current mission is to reconnect with its history, and discover its unique repertoire, to ensure production and dissemination of operas for the wider public. Mainstays of the repertory at the Opéra-Comique during its history have included the following works which have each been performed more than 1,000 times by the company: "Cavalleria Rusticana", "Le chalet", "La dame blanche", "Le domino noir", "La fille du régiment", "Lakmé", "Manon", "Mignon", "Les noces de Jeannette", "Le pré aux clercs", "Tosca", "La bohème", "Werther" and "Carmen", the last having been performed more than 2,500 times.
Document 11: Le duc d'Albe: Le duc d'Albe (its original French title) or Il duca d'Alba (its later Italian title) is an opera in three acts originally composed by Gaetano Donizetti in 1839 to a French language libretto by Eugène Scribe and Charles Duveyrier. Its title, which translates as "The Duke of Alba", refers to its protagonist Fernando Álvarez de Toledo, 3rd Duke of Alba. The work was intended for performance at the Paris Opéra. However, William Ashbrook notes that "Rosine Stoltz, the director's mistress, disliked her intended role of Hélène and Donizetti put the work aside when it was half completed"
Document 12: Le roi l'a dit: Le roi l'a dit ("The King Has Spoken") is an opéra comique in three acts by Léo Delibes to a French libretto by Edmond Gondinet. It is a lively comedy, remarkably requiring 14 singers – six men and eight women. The libretto had first been offered in 1871 to Offenbach; the title also went through various permutations ("Le Talon rouge", "Si le Roi le savait", "Le Roi le sait") before settling on its final name. The 1885 revival brought further modifications to the libretto.
Document 13: Rita (opera): In 1841, while Donizetti was in Paris waiting for the libretto to be completed for a commission by La Scala, he had a chance encounter with Gustave Vaëz, who had co-written the libretti for two of his earlier operas, "Lucie de Lammermoor" (the French version of "Lucia di Lammermoor") and "La favorite". He asked Vaëz if he could provide a libretto for a short opera to keep him busy while waiting for the La Scala project to advance. Vaëz quickly created "Deux hommes et une femme" ("Two Men and a Woman"), a comic piece in one act consisting of eight musical numbers connected by spoken dialogue. According to Vaëz, Donizetti completed the score in eight days. However, the Opéra-Comique rejected it and Donizetti then had the libretto translated into Italian for an intended performance at the Teatro del Fondo in Naples. Following the death of the Teatro del Fondo's impresario, Domenico Barbaja, the Naples performance fell through. The score, still unperformed, was found in Donizetti's effects when he died in 1848.
Document 14: Fervaal: Fervaal is an opera ("action musicale" or lyric drama) in three acts with a prologue by the French composer Vincent d'Indy, his opus 40. The composer wrote his own libretto, based in part on the lyric poem "Axel" by the Swedish author Esaias Tegnér. D'Indy worked on the opera over the years 1889 to 1895, and the score was published in 1895.
Document 15: Lisis et Délie: Lisis et Délie (or Lysis et Délie) was a one-act pastoral opera with music by Jean-Philippe Rameau and a libretto by Jean-François Marmontel. The musical score is now lost. It was scheduled to appear at Fontainebleau on 6 November 1753 as part of the celebrations for the birth of the royal prince Xavier, Duke of Aquitaine. It was due to form a double bill with the "comédie-ballet" "Les hommes" (words by Germain-François Poullain de Saint-Foix, music by François-Joseph Giraud). However, it was withdrawn from performance and "La danse", the third "entrée" of Rameau's "Les fêtes d'Hébé", was performed in its place. The reason given for the work's cancellation was that it was too similar to Rameau's "Daphnis et Eglé", premiered at Fontainebleau on 30 October. The libretto was published but the music does not survive. Rameau may have reused some of it in his later operas.
ground_truth: La Favorite