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. 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