问题：
[单选题]电子政务信息安全技术基础设施为电子政务各种应用系统建立通用的安全接口,提供通用的安全服务,主要包括( )、授权管理基础设施和密钥管理基础设施。
A、公钥基础设施
B、私钥基础设施
C、数字签名基础设施
D、加密解密基础设施
参考答案：
A
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