____________ is the Gaia command that turns the server off.

'sysdown' is not a valid command in the Gaia CLI and does not exist in Check Point Gaia OS.

'exit' closes the current shell session or logs out the current user but does not shut down or power off the server.

The 'halt' command in Check Point Gaia OS initiates a controlled shutdown of the operating system, stopping all running processes and powering off the server. It is the standard Unix-derived command recognized by Gaia for server shutdown, equivalent to a safe power-off sequence that prevents data corruption.

'shut-down' is not a valid Gaia CLI command; the correct syntax for shutdown in Gaia is 'halt' or 'reboot'.