In the Context of Employment and Use of the Internet,which

In the context of employment and use of the internet,which of the following is true?

A) Employers can be liable when their employees misuse the internet.
B) Viewing an employee's Facebook account is considered a criminal offence.
C) Employers cannot be held liable when their employees misuse the internet.
D) An employer need not have a clear and comprehensive policy prohibiting misuse of company resources such as the internet.
E) Email should be encouraged over other forms of communication,because it is inherently private.