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.)

`shutdown -R` is not a valid flag; the correct flag for reboot is `-r`, and shutdown does not use `-R 1` to target a specific runlevel in single-user mode.

`shutdown -single` is not a valid shutdown option; no such flag exists in the standard SysV shutdown command syntax.

The `init` command is the direct interface to the SysV init process and accepts a runlevel argument; `init 1` signals the init daemon to transition to runlevel 1, which is single-user maintenance mode where only essential services run.

The `telinit` command is functionally equivalent to `init` - it communicates with the running init process via signals to request a runlevel change; `telinit 1` transitions to single-user mode just as `init 1` does.

`runlevel` is a query command that displays the previous and current runlevel - it cannot be used to change the system's runlevel.