Which set of actions satisfy the requirement for multifactor authentication?

Which set of actions satisfy the requirement for multifactor authentication?

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