A user would like to send a message and allow only one other person to verify the integrity of the message. You would need to implement which function?

A.
One-way hash

B.
Message digest

C.
Message authentication code

D.
Trapdoor one-way function

Explanation:
Message authentication code is a one-way hashing function, except that
the resulting hash value is the function of the message and the key. This ensures
that only the person with the necessary key can verify the integrity of this
message. Other answers have some similar functionality, but an MAC is the best
answer that allows for only the person with a specific key to verify the integrity.