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.