公司系统管理员小王，想进入单用户模式的Linux菜单上按（）键，就会进入GRUB编辑界面？

A./etc/passwd
B./etc/hosts
C./etc/inittab
D./etc/named

A.runlevel
B.grep
C.chkconfig
D.find

A.cat/etc/issue
B.cat-n/etc/issue
C.more/etc/issue
D.ls/etc/issue