Which of the following is an example of multifactor authentication?

A.
Credit card and PIN

B.
Username and password

C.
Password and PIN

D.
Fingerprint and retina scan

Explanation:
A credit card is a memory card that functions a type of two-factor authentication. The card is something you have, and its PIN is something you know. Multifactor
authentication requires a user to provide two or more different types of authentication factors to prove their identity.
Incorrect Answers:
B, C, D: Each of these options offers 2 authentication factors. Each authentication factor pair is, however, of the same type.
Username and password something you know.
Password and PIN something you know.
Fingerprint and retina scan something you are.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp 280, 282.