Which element can be used by a threat actor to discover a possible opening into a target network and can also be used by an analyst to determine the protocol of the malicious traffic?

Which element can be used by a threat actor to discover a possible opening into a target network and can also be used by an analyst to determine the protocol of the malicious traffic?
A . TTLs
B . ports
C . SMTP replies
D . IP addresses

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Answer: B