Shawn Needs to Record His Business Voicemail Outgoing Message

Shawn needs to record his business voicemail outgoing message. Which of the following outgoing messages is most professional?

A) Hi! I'm sorry I missed your call. Please leave a brief message after the tone.
B) This is Shawn. I'm not available right now. But if you leave a message, I promise to call you back. Be sure to include your name, phone number, and the best time to return your call.
C) Your call is important to me. Please leave your name and number so that I can return your call promptly.
D) Hi! You have reached the voice mail of Shawn Berg of Juarez Accounting. I am currently away from my phone but will return by 2 p.m. Please call back then. Thank you for calling.