A security engineer, Joe, has been asked to create a secure connection between his mail server and the mail
server of a business partner. Which of the following protocol would be MOST appropriate?

A.
HTTPS

B.
SSH

C.
FTP

D.
TLS

Explanation:
Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a
computer network. It uses X.509 certificates and hence asymmetric cryptography to authenticate the
counterparty with whom it is communicating, and to exchange a symmetric key. The TLS protocol allows clientserver applications to communicate across a network in a way designed to prevent eavesdropping and
tampering.