Which of the Following Is a Provision Made Under the Berne

Which of the following is a provision made under the Berne Convention?

A) The treaty makes it mandatory to place the copyright symbol on all copyrighted works.
B) The treaty sets the rules for how copyright can be dealt with when sharing copyrighted work between governments.
C) The treaty eliminates the need to place the copyright symbol or the word "copyright" on a copyrighted work.
D) The treaty stipulates the time period a copyright can be retained by the copyright holder before it enters the public domain.