Two-Factor Authentication (2FA) = using two different categories of credentials to verify identity.
In the example:
Something you know → Username & password.
Something you have → Code from an authentication app (or SMS, hardware token).
This combination = 2-factor authentication.
3-factor authentication → Would require three different categories (e.g., password + mobile token + fingerprint).
So correct Answer is 'C'.
It might be both A and C. A - because each piece of information is part of the authentication. 3 pieces of information - 3-factor authentication. C - username often is not counted as a piece of authentication information.
he requirement to enter a username and password (something you know) plus a code sent to an authentication app (something you have) constitutes two factors of authentication.
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