Which of the following commands brings a system running SysV init into a state in which it is safe to perform maintenance tasks? (Choose TWO correct answers.)

Which of the following commands brings a system running SysV init into a state in which it is safe to perform maintenance tasks? (Choose TWO correct answers.)
A . shutdown -R 1 now
B . shutdown -single now
C . init 1
D . telinit 1
E . runlevel 1

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Answer: CD