CompTIA Security+ Question G-2

Which of the following BEST describes using a smart card and typing in a PIN to gain access to a system?

A. Biometrics
C. Single factor authentication
D. Multifactor authentication

Answer: D

Multifactor authentication requires a user to provide two or more authentication factors for authentication purposes. In this case, a smart card (something they have) is one and a PIN (something they know) is the second.