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單項(xiàng)選擇題

For security reasons, an administrator is asked to modify the system to prevent someone from 
leaving a terminal logged in. 
Which of the following options would enable a five minute timeout for all users()

A.Add the following line to /etc/environment: TMOUT=300
B.Add the following lines to /.profile TMOUT=5 export TMOUT
C.Run the following command: chuser -u ALL -a TIMEOUT=5M
D.Run the following command: chsec -u ALL -a TIMEOUT=600

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