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.)

The shutdown command does not accept -R as a flag for specifying a runlevel; -r means reboot, so shutdown -R 1 now is invalid syntax and would not bring the system to single-user mode.

shutdown does not support a -single flag; the correct shutdown syntax for single-user mode would be shutdown -h or using init/telinit directly.

The init command, when called directly with a runlevel argument like init 1, signals the init process (PID 1) to switch to runlevel 1 (single-user mode), stopping non-essential services for safe maintenance.

telinit is a symlink or wrapper to init designed specifically for sending runlevel-change requests to the running init daemon; telinit 1 is the canonical command for switching to single-user maintenance mode.

The runlevel command is a query-only tool that displays the current and previous runlevels; it cannot be used to change the system's runlevel.