For security reasons， 

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（）

• AAdd the following line to /etc/environment： TMOUT=300
• BAdd the following lines to /.profile TMOUT=5 export TMOUT
• CRun the following command： chuser -u ALL -a TIMEOUT=5M
• DRun the following command： chsec -u ALL -a TIMEOUT=600