题目内容
（请给出正确答案）
[主观题]
Rosa is a Linux administrator at a new job.Her new boss tells her to ensure that all t
he passwords on the Linux system are secure.Which action should Rosa perform. first to ensure password security？()
A.Implement a strong password policy, then train all end users about strong password use
B.Verify that passwords are being stored in a password shadow file
C.Implement a password aging policy then notify all end users about the change
D.Instruct all users to change their passwords
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