单选题Which statement is true about a certificate authority？（）AAn entity responsible for registering the private key encryption used in a PKIBAn agency responsible for granting and revoking public-private key pairsCA trusted third party responsible for signing the public keys of entities in a PKIbased systemDA trusted third party responsible for signing the private keys of entities in a PKIbased system
单选题
Which statement is true about a certificate authority？（）
A
An entity responsible for registering the private key encryption used in a PKI
B
An agency responsible for granting and revoking public-private key pairs
C
A trusted third party responsible for signing the public keys of entities in a PKIbased system
D
A trusted third party responsible for signing the private keys of entities in a PKIbased system
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