What command is used to view the running configuration?

The command used to view the running configuration in Cisco devices is "show running-config." This command is executed in the privileged EXEC mode and displays the current configuration that is actively running on the device, including all interface settings, routing protocols, and other configuration parameters. Understanding how and when to use this command is crucial for network management, as it allows administrators to confirm configurations, troubleshoot issues, and verify that the network device is behaving as intended.

The other options do not correspond to any valid Cisco IOS commands for viewing the running configuration and would not yield the required information when entered in the CLI (Command Line Interface).