Leticia Has Called a Client and Received His Voice Mail

Leticia has called a client and received his voice mail. What is the best advice you can give Leticia for leaving a message?

A) Hang up and call back later; her client won't want to be bothered with having to listen to a message.
B) Speak as quickly as possible to make her message more concise.
C) Smile when leaving her message to add warmth to her voice.
D) Leave a complete message, including confidential details about the project Leticia is working on, to make her message as useful as possible.