- Answer is B: 5
- Answer is C: runlevel
- Answer is D: who –r
- Answer is B: The previous runlevel before it was changed to the current runlevel
- Answer is D: Single user
- Answer is B: init
- Answer is C: telinit
- Answer is A: systemctl get-default
- Answer is C: systemctl list-dependencies –type target
- Answer is B: systemctl isolate multi-user.target
- Answer is A: systemctl status multi-user.target
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