A mobile device user has entered her user ID and password to access an online account. The user immediately receives a text message with a unique PIN that must be entered before she is granted access to the account.
Which of the following describes the security method being used?
A. Multifactor authentication
B. Full device encryption
C. Biometric authentication
D. Fingerprint unlock

A. Multifactor authentication

Explanation:

Multifactor authentication is a security system process that requires a user to verify his or her identity by providing two categories of credentials.

A mobile device user has entered her user ID and password to access an online account, she immediately receives a text message with a unique PIN or One Time Password (OTP) that must be entered before she is granted access to the account. This is an example of a multifactor authentication security method.