You are called by an author who is writing a book and he wants to know how long the copyright for his book will last after he has the book published?

You are called by an author who is writing a book and he wants to know how long the copyright for his book will last after he has the book published?

A.
70 years

B.
the life of the author

C.
the life of the author plus 70 years

D.
copyrights last forever