Question: After a user logs in with a password, a passcode is then sent to their cell phone, which then must be entered in before access

After a user logs in with a password, a passcode is then sent to their cell phone, which then must be entered in before access is granted. This is an example of which of the following.
Encryption
Normalized authentication
Key logging
Two-factor authentication
Biometrics
Secure device authentication
Authenticated authentication
Single-factor authentication
Secure authentication
ERP authentication
After a user logs in with a password, a passcode

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