题目内容

系统管理员应该采用哪些安全措施？（）

A. 把root密码告诉每一位用户
B. 设置Telnet服务来提供远程系统维护
C. 经常检测帐户数量、内存信息和磁盘信息
D. 当员工辞职后，立刻删除该用户帐户

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