You work as a Network Administrator for a medium sized business. Spam has become a significant problem for your company. You want to have a common network wide solution. You want a solution that is easy to administer. However, you do not want your solution to hinder the performance of your email server.
What is the best solution for you to implement?

A.
Utilize a client side anti-spam solution.

B.
Use a combination of mail server engine and client side.

C.
Utilize a gateway filter anti-spam solution.

D.
Utilize a mail server engine anti-spam solution.