The option that is not an example of a factor used in multi-factor authentication is option C: A captcha.
The process of establishing the veracity of a claim, such as the identity of a computer system user, is known as authentication. Authentication, as opposed to identification, is the process of confirming a person's or thing's identity.
To ascertain whether a user is human, a challenge-response test known as a CAPTCHA is often used in computing.
Note that a CAPTCHA only verify if you are human and it is not a type of authentication.
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