A user tries to log on to his bank account via the Internet with his username and password. The webpage then displays a message indicating a code was sent to his smartphone and prompts him to enter a six-digit code. What type of authentication is this?

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A user tries to log on to his bank account via the Internet with his username and password. The webpage then displays a message indicating a code was sent to his smartphone and prompts him to enter a six-digit code. What type of authentication is this?