How many factors does MFA require for authentication?

• A. It uses only biometrics.
• B. Two or more proof factors.
• C. It relies on security questions only.
• D. It requires a single password.

Answer: (B)

Multi-factor authentication is stronger because it requires two or more proof factors to verify who you are. These factors come from different categories: something you know, something you have, and something you are. By using at least two of these, MFA adds security beyond a single credential. Using only biometrics means just one factor is involved, so it isn’t MFA by itself. Relying on security questions only is also a single factor and can be weak. A single password is another single factor. So the core idea is that MFA demands two or more proof factors to authenticate.