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.