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【单选题】
下列不属于计算机网络安全特征的有()保密性：信息不泄露给非授权用户、实体或过程，或供其利用的特性。完整性：数据未经授权不能进行改变的特性。即信息在存储或传输过程中保持不被修改、不被破坏和丢失的特性。可用性：可被授权实体访问并按需求使用的特性。即当需要时能否存取所需的信息。例如网络环境下拒绝服务、破坏网络和有关系统的正常运行等都属于对可用性的攻击;可控性：对信息的传播及内容具有控制能力。
A.
保密性
B.
完整性
C.
可用性
D.
相关性
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