Question

A client submits email to a mail server using a service that requires encryption before authentication. Which combination is appropriate?

A SMTP over an encrypted transport such as TLS for secure submission.
B DNS over ARP because mail servers require MAC-based authentication.
C FTP over ICMP because SMTP is limited to file-transfer sessions.
D HTTP over UDP because email submission does not need reliability.
E DHCP over TCP because credentials must be assigned dynamically.
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