Your company network includes Microsoft Exchange Server 2007 and Forefront Protection for Exchange (FPE) 2010 in a Windows Server 2008 environment. You use the FPE console to monitor all antivirus and antimalware engines. You detect that a spam attack has occurred. You analyze the following messages:

You need to create a filter that will prevent the occurrence of this type of email in the future.

Which type of filter should you use?

A.
file

B.
keyword

C.
subject line

D.
sender-domain