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单项选择题For security reasons， an administrator is asked to modify the system to prevent someone from leaving a terminal logged in. To enable a five minute timeout for all users， what would need to be done to accomplish this task？（）

A、Add the following line to /etc/environment：  TMOUT=300

B、Add the following lines to /.profile  TMOUT=5  export TMOUT

C、Execute the following command：  chuser -u ALL -a TIMEOUT=5M

D、Execute the following command：  chsec -u ALL -a TIMEOUT=600

  • A

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