What is multi-factor authentication (MFA) and why is it more secure than a password alone?

• A. It relies on security questions only.
• B. Authentication requiring two or more proof factors; reduces risk of credential compromise.
• C. It uses only biometric verification.
• D. It uses a single password.

Answer: (B)

Multi-factor authentication means proving your identity using two or more different kinds of factors. These factors comic come from categories like something you know (a password), something you have (a phone code or security key), and something you are (biometrics). By requiring more than one type of evidence, even if a password is stolen, an attacker still needs the second factor to access the account. That’s why MFA is more secure than using a password alone.

The best description emphasizes two or more proof factors and the reduced risk of credential compromise. Using security questions only, or relying on biometric verification alone, or sticking with a single password all rely on a single form of proof, which is much easier for attackers to defeat.