In addition to assigning a unique user ID, authentication must employ at least one of which methods to authenticate all users?

• A. In addition to unique ID, employ at least one of: password, token, or biometric.
• B. Unique ID alone is sufficient.
• C. Unique ID plus no authentication.
• D. Unique ID plus biometric only required.

Answer: (A)

After assigning a unique user ID, authentication must verify who the user is using at least one of the listed factors. This means you need to add at least one of: something the user knows (a password), something the user has (a token), or something the user is (a biometric). Relying on the unique ID alone does not prove identity and leaves access poorly protected. The other options fail because they either omit the required additional factor, propose no authentication, or wrongly restrict the acceptable method to only biometric. The correct approach is to pair the unique ID with at least one of the allowed authentication methods.