Which statement is a feature of HMAC?

Which statement is a feature of HMAC?

• HMAC uses a secret key that is only known to the sender and defeats man-in-the-middle attacks.
• HMAC uses protocols such as SSL or TLS to provide session layer confidentiality.
• HMAC uses a secret key as input to the hash function, adding authentication to integrity assurance.
• HMAC is based on the RSA hash function.

Explanation: A keyed-hash message authentication code (HMAC or KHMAC) is a type of message authentication code (MAC). HMACs use an additional secret key as input to the hash function, adding authentication to data integrity assurance.

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