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Select 2 answers.
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Options C. init 1 and D. telinit 1 bring a system running SysV init into a state in which it is safe to perform maintenance tasks. Option A: The shutdown -R 1 now command does not bring the system into a maintenance state. The -R option tells shutdown to reboot the system, not to enter a maintenance state. Option B: The shutdown -single now command does not bring the system into a maintenance state. The -single option tells shutdown to boot the system into single-user mode, which is a minimal environment used for maintenance tasks. However, the command must also specify a time at which the boot should occur.
Option C: The init 1 command tells init to switch to runlevel 1, which is the runlevel used to boot the system into single-user mode. Single-user mode is a minimal environment used for maintenance tasks and is safe to perform maintenance in. Option D: The telinit 1 command is equivalent to init 1 and tells init to switch to runlevel 1, which is the runlevel used to boot the system into single-user mode. Option E: The runlevel 1 command does not exist. The runlevel command is used to display the current runlevel of the system, not to change it.