The act of requiring two of the three factors to be used in the authentication process refers to?

A.
Two-Factor Authentication

B.
One-Factor Authentication

C.
Bi-Factor Authentication

D.
Double Authentication

Explanation:
Two-Factor Authentication is a security process that confirms user identities using
two distinctive factors—something you know, such as a Personal Identification Number (PIN), and
something you have, such as a smart card or token.
The overall strength of Two-Factor Authentication lies in the combination of both factors,
something you know and something you have.