Mark works as a Network Administrator fot Blue WellInc. The company has a Windows-based network.
Mark is facing a series of problems with email spamand identifying theft via phishing scams. He wants to implement the various security measures and to provide some education because it is related to the best practices while using email. Which of the followingcan Mark do after enabling reverse DNS lookups to minimize the amount of spam?

A.
Permit User Account Control

B.
Add Sender Policy Framework

C.
Use Read-only Domain Controller

D.
Windows Server Update Services