The Book "Fort Apache" Dealt with the Story of a Battle

Multiple Choice

The book "Fort Apache" dealt with the story of a battle at a frontier fort and the film "Fort Apache: The Bronx," was a story about the challenges of police officers in battling crime in the Bronx area of New York City.The author of "Fort Apache" has brought suit against the film makers.
-What would be the basis of the suit?

A) Trade Name
B) Trademark
C) Copyright
D) both a and b