Question: Which three rules are required when you configure listeners on the Cisco ESA? ( Choose three. ) Each listener on any single interface has a

Which three rules are required when you configure listeners on the Cisco ESA? (Choose three.)
Each listener on any single interface has a different port.
Listeners support both IP version 4(IPv4) and version 6(IPv6) addresses.
The blackhole listener is available through the GUI and CLI listenerconfig command.
SMTP and QMQP are the mail protocol to service email connections.

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