Which action changes the default editor for ALL users on the system from vi to edit of the following？（）

• A、Issue the command：  export EDITOR=/usr/bin/edit
• B、Modify /.profile and change the EDITOR variable to /usr/bin/edit
• C、Modify /etc/environment and add  EDITOR=/usr/bin/edit  export EDITOR
• D、Modify /etc/security/defaults and change the EDITOR value to /usr/bin/edit