Which of the following commands reboots the system when using SysV init? (Choose TWO correct answers.)

The `shutdown` command with the `-r` option initiates a reboot, and `now` specifies that the reboot should happen immediately after sending warnings and gracefully stopping services.

`shutdown -r "rebooting"` is syntactically incorrect; the `shutdown` command requires a time argument (e.g., `now` or `+minutes`) after `-r` to specify when the reboot should occur, not a message in its place.

`telinit 6` instructs the init process to change the system's run level to 6, which is the standard run level designated for system reboot in SysV init.

`telinit 0` changes the run level to 0, which is designated for system halt or power-off, not for rebooting the system.

`shutdown -k now "rebooting"` only sends a warning message to logged-in users; the `-k` option means 'don't actually shut down', so it would not reboot the system.