An administrator made a change to a system's network configuration. Which of the following best represents what the administrator should do to have the new configuration take effect?

In systemd-managed Linux environments, configuration modifications made to network interface profiles or network daemon files do not automatically alter the runtime state of active interfaces. To apply newly defined configurations, the system administrator must restart the associated management daemon. Running the systemctl restart networkd command stops the running service instance and immediately starts a fresh instance, forcing the network management daemon to re-read its configuration files from disk and reapply the updated network settings to system network interfaces without requiring a full system reboot.

B: Running systemctl enable configures the service to start automatically during system boot but does not restart or apply new settings to running daemons. C: Running systemctl status only displays runtime state and diagnostic logs of a unit without applying any configuration changes. D: Running systemctl isolate changes the active system target state to a specified target rather than reloading a network service configuration.

systemd Project Documentation, systemctl(1) Manual Page: "Service Management Commands: restart, reload".

Red Hat Enterprise Linux 8 System Administrator's Guide, Chapter 3: "Managing System Services with systemctl".