Which of the following statements best describes a certification authority?

Which of the following statements best describes a certification authority?
A . A certification authority is a technique to authenticate digital documents by using computer cryptography.
B . A certification authority is a type of encryption that uses a public key and a private key pair for data encryption.
C . A certification authority is an entity that issues digital certificates for use by other parties.
D . A certification authority is a type of encryption that uses a single key to encrypt and decrypt data.

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Answer: C