Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue.target mode for maintenance. Which of the following…

`telinit 0` shuts down the system, which does not restore it to a running 'usual target' but rather powers it off.

`systemctl reboot` restarts the server, which then boots into its default configured target (e.g., `multi-user.target`), effectively restoring it to its usual operational mode from `rescue.target`.

`systemctl get-default` only displays the configured default target, it does not switch the system's current target or initiate a boot.

`systemctl emergency` switches the system to an even more restricted `emergency.target` mode, which is the opposite of restoring normal operations.