Which of the Following Statements with Regards to Defamation Over

Which of the following statements with regards to defamation over the internet is true.

A) If the ISP encourages the offending behaviour, or if they ought to have known of it , the intermediary cannot be held liable for defamation.
B) If the author is unknown or uses a false name, bringing an action for defamation presents little difficulty.
C) If the author resides in another jurisdiction, an action for defamation in all circumstances, can be brought against the ISP.
D) Where the communication is found to be defamatory, the first question to be determined is whether the statement is libel or slander.
E) If the author is unknown, intermediaries, such as ISP's or website operators, can always be held liable for defamation.