Which set of action satisfy the requirement for multi-factor authentication?

Which set of action satisfy the requirement for multi-factor authentication?
A . The user swipes a key fob, then clicks through an email link.
B . The user enters a user name and password, and then clicks a notification in an authentication app on a mobile device.
C . The user enters a PIN into an RSA token, and then enters the displayed RSA key on a login screen.
D . The user enters a user name and password and then re-enters the credentials on a second screen.

View Answer

Answer: B

Explanation:

This is an example of how two-factor authentication (2FA) works: