A network administrator noticed various chain messages have been received by the company.
Which of the following security controls would need to be implemented to mitigate this issue?

A.
Anti-spam

B.
Antivirus

C.
Host-based firewalls

D.
Anti-spyware

Explanation:
A spam filter is a software or hardware solution used to identify and block, filter, or
remove unwanted messages sent via email or instant messaging (IM).