Question: To use a two - factor authentication protocol you need a password and what else? Group of answer choices Any of the above depending on

To use a two-factor authentication protocol you need a password and what else?
Group of answer choices
Any of the above depending on the system.
Some other secret that you know like a PIN or answer to a secret question.
Some physical aspect of yourself like a fingerprint or iris scan.
Something physical like a credit card or hardware token.

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