An administrator needs to change a system’s run level from level 2 to level 3. What is the appropriate  method to accomplish this（）A、Use the reboot command.B、Edit the /etc/reboot file and reboot the system.C、Edit /etc/.init.state file and reboot the syste

An administrator needs to change a system’s run level from level 2 to level 3. What is the appropriate  method to accomplish this（）

• A、Use the reboot command.
• B、Edit the /etc/reboot file and reboot the system.
• C、Edit /etc/.init.state file and reboot the system.
• D、Use the telinit command