Which Items Need to Be Included When Taking a Message

Which items need to be included when taking a message?

A) Caller's name and phone number and when the dentist is to return the call
B) Caller's name, the caller's phone number if a call back is requested, and the reason for the call
C) Phone number where the caller can be reached and the reason for the call
D) Caller's name and phone number, the time of the call, and when the dentist is to return the call