Which set of actions satisfies the requirement for multifactor authentication?

The user enters a user name and password, and then clicks a notification in an authentication app on a mobile device.

The user swipes a key fob, then clicks through an email link.

The user enters a PIN into an RSA token, and then enters the displayed RSA key on a login screen.

The user enters a user name and password, and then re-enters the credentials on a second screen.