单选题Which of the following can an operator use to shutdown a system into single-user mode?（）Ashutdown -dBshutdown -sCshutdown -mDshutdown -Fr -s 1
单选题
Which of the following can an operator use to shutdown a system into single-user mode?（）
A
shutdown -d
B
shutdown -s
C
shutdown -m
D
shutdown -Fr -s 1
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