Which set of configuration choices will best help reduce the volume of messages that need
to be processed by the filtering engine?

A.
deleting all spam messages, deleting all virus attachments, configuring sender
authentication

B.
enabling LDAP authentication, quarantining all spam and suspected spam, and
increasing concurrent MTA connections

C.
controlling maximum attachment sizes, setting a lower recursion limit for ZIP files,
enabling bad message handling

D.
enabling SMTP traffic shaping, rejecting Zombie connections in Sender Groups,
configuring invalid recipient configuration