在CentOs系统中，执行（）命令可以在创建admin账号，并同时其宿主目录也为/admin.（选择一项）

A.killall +9 2041

B.killall -9 2041

C.kill +9 2041

D.kill -9 2041

A.hmod 655 local.repo

B.hmod a=rw local.repo

C.hmod o+rw local.repo

D.hmod g+rw local.repo

A.yum upgrade

B.pt-get install

C.yum install

D.pt-get upgrade

A.GNU is Not UNIX GNU is GNU

B.GNU is GNU GNU is Not UNIX

C.GNU is Not UNIX

D.GNU is GNU

A.shutdown-c23

B.shutdown-r23:00

C.reboot23:00

D.reboot23

A.zcf

B.zxf

C.jcf

D.jxf

A.shutdown -c 23

B.shutdown -r 23:00

C.reboot 23:00

D.reboot 23

A.reboot

B.halt

C.shutdown-rnow

D.shutdown-hnow

A.zcf

B.zxf

C.jcf

D.jxf

A.shutdown -h now

B.shutdown -k now

C.halt

D.poweroff