Question: Who produced an animated adventure film about racing that was released alongside a short film written and directed by Dave Mullins?
Context: Guardians of Oz (Spanish: Guardianes de Oz ; released internationally as Wicked Flying Monkeys) is a 2015 Mexican-Indian 3D computer animated adventure film, directed by Alberto Mar and executive produced by Jorge Gutierrez.  The film is produced by Ánima Estudios, Discreet Arts, and distributed by FilmSharks International.  The film is first English-language and flagship CG production for Ánima Estudios, as well as the studio's biggest production and is described as Mexico's biggest animated production.  Mexico's take on the "Wizard of Oz" books by L. Frank Baum, it features an original story and new characters, and was released theatrically on 10 April 2015 in Mexico. "Born Free" is a song by English recording artist M.I.A., released alongside an accompanying short film/music video of the same name from her third album, "Maya".  XL Recordings and Interscope Records/N.E.E.T. released "Born Free" as a digital download from the album on 23 April 2010, with the music video released on 26 April 2010.  "Born Free" was composed by Maya "M.I.A." Arulpragasam, Dave "Switch" Taylor, Alan Vega and Martin Rev, with production by M.I.A. and Switch.  The artwork for the single was released on 25 April 2010. Cars 3 is a 2017 American 3D computer-animated auto racing sports comedy adventure film produced by Pixar and released by Walt Disney Pictures.  Directed by Brian Fee, the screenplay was written by Kiel Murray, Bob Peterson and Mike Rich.  The film is a sequel to "Cars" and a stand-alone sequel to "Cars 2".  The returning voices of Owen Wilson, Bonnie Hunt and Larry the Cable Guy are joined by Cristela Alonzo, Chris Cooper, Armie Hammer, Nathan Fillion, Kerry Washington and Lea DeLaria, in addition to a dozen NASCAR personalities.  In the film, Lightning McQueen sets out to prove to a new generation of high tech race cars that he is still the best race car in the world. Lou is a 2017 computer-animated short film produced by Pixar Animation Studios.  Written and directed by Dave Mullins, it was theatrically released alongside Pixar's "Cars 3" on June 16, 2017.  The short is about a lost and found box and the unseen monster within. Peter Pan is a 1953 American animated adventure film produced by Walt Disney and based on the play "Peter Pan, or The Boy Who Wouldn't Grow Up" by J. M. Barrie.  It is the 14th Disney animated feature film and was originally released on February 5, 1953, by RKO Radio Pictures.  "Peter Pan" is the final Disney animated feature released through RKO before Walt Disney's founding of his own distribution company, Buena Vista Distribution, later in 1953 after the film was released.  "Peter Pan" is also the final Disney film in which all nine members of Disney's Nine Old Men worked together as directing animators.  It is also the second Disney animated film starring Kathryn Beaumont, Heather Angel, and Bill Thompson after their roles in the animated feature "Alice in Wonderland". Cóndor Crux, la leyenda (English: Condor Crux, the Legend) is a 2000 Argentine animated adventure film written and directed by Juan Pablo Buscarini and Swan Glecer.  The film premiered on 6 January 2000 in Buenos Aires.  The film won a Silver Condor for Best Animated film. Pikyaw is a 2014 Filipino animated adventure film produced by Multimedia Arts & Graphics Ensemble (MAGE), Inc. and directed by Arnold Fuentes, PIKYAW was the first feature-length animated film dubbed in Hiligaynon and created by artists from Iloilo City, Iloilo, and the first film produced by MAGE, Inc. "Pikyaw" follows a group of children: Abet, Tyrone, and Marco who finds themselves in a parallel universe that is the subject of revenge by Albion, a creature who lived in Calixto since he was a child.  The film was written by Mahnnie Tolentino, and featured music by artists from Think Logic Records, who are all Ilonggo bands.  Its executive producers were Mahnnie Tolentino(MAGE Inc.), Ralph Peñalosa(TL Records) and Seth dA.  Nono(UI-PHINMA). Dinosaur is a 2000 American CGI animated adventure film produced by Walt Disney Feature Animation and The Secret Lab and released by Walt Disney Pictures.  It is the 39th Disney animated feature film and Disney's The Secret Lab computer animated feature, though it is not officially labeled as one of the animated classics in the United Kingdom, where "The Wild" (2006) is included in the canon instead. The Man in the Iron Mask is a 1985 Australian made-for-television animated adventure film directed by Geoff Collins and produced by Burbank Films Australia.  It is based on Alexandre Dumas' .  It was written by Keith Dewhurst.  The plot takes place years after "The Three Musketeers" (1986) - even though the latter animated film was released one year later -, and it is known for a scene that displays a complex fireworks animation, as well for its bittersweet ending. Piper is a 2016 computer-animated short film produced by Pixar Animation Studios.  Written and directed by Alan Barillaro, it was theatrically released alongside Pixar's "Finding Dory" on June 17, 2016.  It won the Academy Award for Best Animated Short Film at the 89th Academy Awards.
Answer: Pixar