Which sequence of actions satisfies the requirements for multifactor authentication?
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Correct answer: The user enters a user name and password, and then clicks a notification in an authentication app on a mobile device..
Why this is the answer
Multifactor authentication (MFA) requires two or more distinct authentication factors from different categories. The correct option uses "something you know" (username and password) and "something you have" (the mobile device with the authentication app). The first incorrect option describes two instances of "something you know," which is not MFA. The second incorrect option uses "something you have" (key fob) and "something you have" (access to an email account, which implies possession of the device to read it), failing to use distinct factors. The fourth incorrect option also uses two instances of "something you have" (the RSA token and the displayed key generated by it), which is not MFA.
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