Which of the following protocols employs the above features to encrypt an email message?

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Steve was sharing his confidential file with John via an email that was digitally signed and encrypted. The digital signature was made using the "Diffie-Hellman (X9.42) with DSS" algorithm, and the email was encrypted using triple DES.

Which of the following protocols employs the above features to encrypt an email message?
A . S/MIME
B . EAP
C . RADIUS
D . TACACS+

Answer: A