What must be done on the Cisco ESA to accomplish this goal?

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An engineer has enabled LDAP accept queries on a listener. Malicious actors must be preventec from quickly identifying all valid recipients.

What must be done on the Cisco ESA to accomplish this goal?
A . Use Bounce Verification
B . Configure incoming content filters.
C . Configure Directory Harvest Attack Prevention
D . Bypass LDAP access queries in the recipient access table.

Answer: C