Which of the Following Is an Effective Voice Mail Technique

Which of the following is an effective voice mail technique?

A) You should leave only your name and number in order to be as efficient as possible.
B) You should begin a voice mail with an overview of the message and then continue with the details.
C) If you want the listener to take action, you must call for it in the beginning of the message.
D) You do not need to directly ask the listener to return your call because by leaving a voice message, you are implying that the listener should call you back.
E) You must speak quickly to ensure that the entire message is recorded.