Generate a correct and concise answer for the question based on the words in the context.

Context : Presidential Reunion is an American comedy Web short directed by Ron Howard and stars Saturday Night Live cast members who parodied Presidents Ford to Obama. 
Question : Which is the basis of Presidential Reunion?
Saturday Night Live

Context : Daffy Duck's Quackbusters is a 1988 Looney Tunes/Merrie Melodies film with a compilation of classic Warner Bros. Cartoons shorts and animated bridging sequences, starring Daffy Duck. 
Question : What production company or companies created Daffy Duck's Quackbusters?
Warner Bros.

Context : Private's Progress is a 1956 British comedy film based on the novel by Alan Hackney. 
Question : The Private's Progress is based upon what?

Alan Hackney

