An engineer is configuring a Cisco Email Security Appliance (ESA) and chooses "Preferred" as the settings for TLS on a HAT Mail Flow Policy. Which result occurs?
A. TLS is allowed for outgoing connections to MTAs. Connection to the listener require encrypted Simple Mail Transfer Protocol conversations
B. TLS is allowed for incoming connections to the listener from MTAs, even after a STARTTLS command received
C. TLS is allowed for incoming connections to the listener from MTAs. Until a STARTTLS command received, the ESA responds with an error message to every command other than No Option, EHLO, or QUIT.
D. TLS is allowed for outgoing connections to the listener from MTAs. Until a STARTTLS command received, the ESA responds with an error message to every command other than No Option (NOOP), EHLO, or QUIT.
