Which three commands can be used to save the configuration on a Cisco device?

The correct answer includes commands that are widely recognized for saving the running configuration to the startup configuration on Cisco devices. Specifically, the command copy running-config startup-config is the primary command used to save the current operational configuration (running configuration) into the non-volatile memory (startup configuration), ensuring that the settings persist through a reboot.

The command write and its variant write memory are shorthand alternatives to copy running-config startup-config, serving the same purpose of saving the configuration. This functionality is crucial for maintaining the configurations across device restarts, as it prevents loss of changes made during an active session.

Other options contain either commands that do not exist in Cisco IOS or are not valid commands for saving configurations, thus making them inappropriate choices. Understanding these commands is vital for Cisco networking professionals as they handle device configurations and ensure their persistence through reboots or power cycles.