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

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

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Answer: A

Explanation: Two-Factor Authentication refers to the act of requiring two of the three factors to be used in the authentication process. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 36