问题：
[单选题]电子政务安全需求中，_______主要是指信息访问的可控性，即只有被授权的、案例级别与数据机密性要求一致的用户才被允许访问相应的数据。
A、认证政务活动中的身份
B、确保政务信息传输安全
C、保障政务信息存储安全
D、系统的安全备份与恢复机制
参考答案：
C
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