Question: How many acts are there in this play in which Joan Collins made her stage debut?

Context paragraphs:
The Cartier Affair: The Cartier Affair is a 1984 NBC TV movie that starred "Knight Rider"' s David Hasselhoff and "Dynasty"' s Joan Collins, which also featured "Kojak"' s Telly Savalas. The Movie was completed during the Dynasty and Knightrider Season breaks.  At the time of its release both Joan Collins and David Hasselhoff were nearing the height of their fame and a real Chemistry formed between the two leads.

Blondes vs. Brunettes: Blondes vs. Brunettes was an ABC TV special that was broadcast on May 14, 1984.  The one-hour variety show, co-hosted by Joan Collins and Morgan Fairchild, was a humorous look at the personality and lifestyle differences between blonde and brunette women.  Time magazine characterized the special as a "showdown" between Collins, "…TV’s brunette meanie and Morgan Fairchild, 34, a blond TV vixen."  At the time of the release, Collins was starring in the popular nighttime soap opera "Dynasty" where she played a dark haired foil to the blonde Linda Evans.

Arthur Collins (rugby union): Arthur Harold Collins, fullback for the All Blacks (1932, 1934) and for Taranaki (1927-1937), was born in Stratford, New Zealand on 19 July 1906.  Weighing in at just 73 kg, and only 1.70m in height, Collins made a name for himself playing club rugby for Stratford and Clifton, and in 1927 was selected for the Taranaki Rugby Football team.  He went on to make 81 appearances for Taranaki over the next eleven years, building a reputation as "a reliable last line of defence and an accurate goalkicker".”

Joan Collins: Dame Joan Henrietta Collins, DBE (born 23 May 1933) is an English actress, author and columnist.  Born in Paddington, west London, and brought up in Maida Vale, Collins grew up during the Second World War.  After making her stage debut in the Henrik Ibsen play "A Doll's House" at the age of nine, she trained as an actress at the Royal Academy of Dramatic Art (RADA) in London.  She then signed an exclusive contract with the Rank Organisation and appeared in various British films.

The Stud (film): The Stud is a 1978 British film starring Joan Collins and Oliver Tobias.  It is based on the 1969 novel of the same name by Collins' younger sister Jackie Collins.

Stuart Piper: Stuart Piper is a London-based Agent and Producer represents actors, comedians and creatives, as Managing Director of Cole Kitchenn Personal Management Ltd and Director of CKP Comedy and ROAR Comedy.  His client list includes actors Janie Dee, Dame Joan Collins, Pixie Lott, Katherine Jenkins OBE, Hannah Spearritt, Marc Pickering, Chizzy Akudolu, Glynis Barber, Rita Simons, Mica Paris, Phoebe Thomas, Louise Jameson, Mark Moraghan, Sid Owen, comedians Jan Ravens, Josie Lawrence, Lewis Macleod and Hal Cruttenden, West-End and Broadway theatre stars 2016 Evening Standard Award Winner Tyrone Huntley, 2017 Olivier Award winner David Bedella, 2017 Whatsonstage Award Winner Emma Williams, Amy Lennox, Cassie Compton, Julie Atherton, Christine Allado, Caroline O'Connor, Rosemary Ashe, Stephen Carlile, Lauren Samuels, Melanie La Barrie, Siobhan McCarthy, Alexandra Silber, Judy Kuhn, Mazz Murray, and creatives Arlene Phillips, Russell Labey and Nick Winston.  In 2010, the agency became part of ROAR Group led by Chairman Jonathan Shalit, expanding to become part of a group of entertainment companies.  His team of agents include Oliver Thomson, Alex Segal, Ashley Vallance, Adam Maskell, Brooke Kinsella MBE, Martha Atack, Sam Day, Charlie Royce, Alex MacMillan.  In July 2015, The Stage called him a "Star Maker" in a front page interview, and Broadcast Magazine have announced him as a Director of new ROAR Comedy company with Corrie McGuire from Objective and Professor Jonathan Shalit OBE.  In Jan 2017 he was announced to have masterminded the acquisition of CKP (Christian Knowles Productions) the agency that represents Micky Flanagan, Zoe Lyons, Hal Cruttenden and Mark Watson and was appointed Director as reported in The Stage and on Chortle.

A Doll's House: A Doll's House (Bokmål: "Et dukkehjem" ; also translated as "A Doll House") is a three-act play written by Henrik Ibsen.  It premiered at the Royal Theatre in Copenhagen, Denmark, on 21 December 1879, having been published earlier that month.  The play is set in a Norwegian town circa 1879.

Pleasantville Music Festival: The Pleasantville Music Festival is a single-day music festival which takes place annually at Parkway Field in Pleasantville, New York.  Some of the many acts that have performed at the Pleasantville Music Festival are: Guster, Gin Blossoms, Jakob Dylan, Joan Osborne, Marc Cohn, Big Head Todd & the Monsters, the English Beat, and Roger McGuinn.  These major acts perform alongside up and coming national acts and small local bands from around the tri-state area.

The Time of Their Lives (2017 film): The Time of Their Lives is a British road comedy film directed and written by Roger Goldby.  The film stars Joan Collins and Pauline Collins.  Joan Collins stars as a former Hollywood movie star who rides to her ex-husband’s funeral on the west coast of France with a best friend, played by Pauline Collins.

The Only Way Is Essex (series 5): The fifth series of The Only Way Is Essex, a British semi-reality television programme, began airing on 15 April 2012 on ITV2.  The series concluded on 27 May 2012 and consisted of ten episodes.  A ""The Only Way Is Marbs"" special aired on 13 June 2012 and is included on the Series 5 DVD.  This is the first series to include new cast members Danni Park-Dempsey, Tom Pearce and Joan Collins, who is the mother of Gemma Collins.  It is the last series to include Georgina Dorsett, who made her debut during the previous series.  The series mainly focused on the bitter fallout between Charlie and Gemma following their break-up and her spreading rumours about his sexuality, as well as the rekindled romance between Joey and Sam, and a new relationships for Tom K and Lydia, Ricky and Jess, and Lauren P and Tom P.  It also included a divide between the boys of Essex, and Lucy and Mario getting engaged.

Supporting paragraphs: Joan Collins A Doll's House
Answer: three-act