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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