Two-factor authentication requires which of the following?

Two-factor authentication requires which of the following?

• A. Two distinct verification methods to access a system.
• B. Two attempts to login before access is denied.
• C. A password and a fingerprint combined into one step.
• D. Only a password is required.

Answer: (A)

Two-factor authentication is about proving your identity with two different verification methods, from separate categories, to access a system. This means you must present two distinct proofs—like something you know (a password) and something you have (a code from a security token) or something you are (a biometric) — rather than relying on a single credential. That’s why the best description is two distinct verification methods to access a system. The other options don’t fit: trying to log in twice isn’t about using two factors; combining a password and a fingerprint in one step isn’t about two separate verifications in two factors, and requiring only a password is just single-factor authentication.

Two-factor authentication is about proving your identity with two different verification methods, from separate categories, to access a system. This means you must present two distinct proofs—like something you know (a password) and something you have (a code from a security token) or something you are (a biometric) — rather than relying on a single credential.

That’s why the best description is two distinct verification methods to access a system. The other options don’t fit: trying to log in twice isn’t about using two factors; combining a password and a fingerprint in one step isn’t about two separate verifications in two factors, and requiring only a password is just single-factor authentication.