Which of the following is the most secure encryption protocol that the network administrator should recommend?

A person approaches a network administrator and wants advice on how to send encrypted email
from home. The end user does not want to have to pay for any license fees or manage server
services. Which of the following is the most secure encryption protocol that the network
administrator should recommend?

A.
IP Security (IPSEC)

B.
Multipurpose Internet Mail Extensions (MIME)

C.
Pretty Good Privacy (PGP)

D.
Hyper Text Transfer Protocol with Secure Socket Layer (HTTPS)