单选题Which of the following is NOT related to a Public key infrastructure (PKI)?以下哪个概念与公钥基础设施(PKI)无关?()AA X.509 certificate(X.509证书)BA Ticket Granting Service(票据授予服务)CA Registration authority(注册机构)DA Certificate authority(证书机构)

单选题
Which of the following is NOT related to a Public key infrastructure (PKI)?以下哪个概念与公钥基础设施(PKI)无关?()
A

A X.509 certificate(X.509证书)

B

A Ticket Granting Service(票据授予服务)

C

A Registration authority(注册机构)

D

A Certificate authority(证书机构)


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