?A user has to provide a valid password to gain access to a vault in a bank. In addition to this, the vault opens only when the user's fingerprint matches the fingerprint data stored in the database or when a valid smartcard is swiped. The authentication method used here is _____.

A. ?hard-drill authentication
B. ?zip-level authentication
C. ?two-factor authentication
D. ?private-key authentication

Answer: C

Computer Science & Information Technology

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