An organization can ensure that the recipients of e-mails from its employees can authenticate the identity of the sender by:

A.
digitally signing all e-mail messages.

B.
encrypting all e-mail messages.

C.
compressing all e-mail messages.

D.
password protecting all e-mail messages.

Explanation:
By digitally signing all e-mail messages, the receiver will be able to validate the authenticity of the sender. Encrypting all e-mail messages would ensure that only the intended recipient will be able to open the message; however, it would not ensure the authenticity of the sender. Compressing all e-mail messages would reduce the size of the message, but would not ensure the authenticity.
Password protecting all e-mail messages would ensure that only those who have the password would be able toopen the message; however, it would not ensure the authenticity of the sender.