In authentication, a token is used to perform what kind of authentication?

• A. Basic login with username only.
• B. Password reset.
• C. Dynamic or two-factor authentication.
• D. Data backup scheduling.

Answer: (C)

Tokens provide an extra factor beyond a username and password, enabling dynamic or two-factor authentication. The token yields a one-time or challenge-based code that you must present (or a cryptographic response you must generate) in addition to your password. This is the essence of two-factor or dynamic authentication: something you know (the password) plus something you have (the token). The other options describe scenarios that don’t add a second factor: a basic login uses only a username, a password reset isn’t ongoing authentication, and data backup scheduling is unrelated to proving identity.