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Q67 Single choice

What useful information is gathered during a successful Simple Mail Transfer Protocol (SMTP) enumeration?

A
The two internal commands VRFY and EXPN provide a confirmation of valid users, email addresses, aliases, and mailing lists.
B
Reveals the daily outgoing message limits before mailboxes are locked
C
The internal command RCPT provides a list of ports open to message traffic.
D
A list of all mail proxy server addresses used by the targeted host

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