What are the three ways of verifying personnel entry?

What are the three ways of verifying personnel entry?
A . Who you are (role) What you know (PIN, password) What you have (badge)
B. Who you are (role) What you know (PIN, password) What you are (biometrics)
C. What you have (credential) What you know (PIN, password) What you are (biometrics)
D. What you have (credential) What you carry (YubiKey) What you are (biometrics)

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Answer: C