单项选择题
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
单项选择题 Anadministratorneedstobeabletolistthenumberandsizeofbackupsetsonatape.Whichofthefollowingproceduresaccomplishthis（）
单项选择题 Auserwantstobepermanentlyaddedtothedbagroup.Whichofthefollowingcommandsorprocessescanbeusedtoaccomplishthis（）
