William, a Penetration Tester in a Pen Test Firm, Was

William, a penetration tester in a pen test firm, was asked to get the information about the SMTP server on a target network. What does William need to do to get the SMTP server information?

A) Send an email message to a non-existing user of the target organization and check for bounced mail header
B) Examine the session variables
C) Examine TCP sequence numbers
D) Look for information available in web page source code

Correct Answer:

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