Which of the following methods provides a possession factor that can be used as part of multifactor authentication for user sign-in?
Typing a username and password
Voice call that delivers or prompts for a one-time passcode to a registered phone number
Drawing an unlock pattern on a touch-screen
Answering user-chosen security questions
A voice call places an automated call to a registered phone number and either prompts the user to approve the sign-in or reads a one-time passcode. Because the user must have physical possession of that phone line, the call satisfies the "something you have" factor and can be combined with a password (something you know) to meet MFA requirements. The other options rely only on knowledge factors and do not supply the required second factor.
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