Stevenson, a u. s. citizen, wrote a book called the ten commandments of leadership. he gave away copies of this book to the people who attended his workshops on leadership. the copyright protection for this book: a. is in effect from the time the book was created and fixed in a copy. b. will be valid for only 20 years from publication of the book. c. will be valid till stevenson dies. d. is nonexistent unless stevenson registers it with the copyright office.