Doug, your YourDomain .com trainee, asks you why authentication is a part of a network security solution. What should you tell Doug?

A.
Authentication is used to create virtual connections between validated remote users and a private network.

B.
Authentication is used to block unwanted connections and content from both internal and external sources.

C.
Authentication is used to validate the identity of users who connect to the network.

D.
Authentication is used to limit the availability of network resources by defining the usage privileges of authorized users.