What are some of the arguments he uses to defend the film?  , What is the role of invention in historical films, according to him?

read the document attached first before answering the questions
In the reading “JFK: Historical Fact/Historical Film,” Robert Rosenstone defends Oliver Stone’s film JFK.
a) What are some of the arguments he uses to defend the film?
b) What is the role of invention in historical films, according to him?