What command do you use to view the startup configuration?

The command used to view the startup configuration on a Cisco device is "show startup-config." This command provides access to the configuration file that is stored in the non-volatile memory (NVRAM) of the device. The startup configuration contains all the settings that will be applied when the device is powered on or reloads, including interfaces, routing configurations, access control lists, and more.

This command is essential for troubleshooting and verifying the configuration that will take effect upon the device's next reboot. Understanding the startup configuration allows network administrators to ensure that the intended settings are correctly stored and will be applied, ensuring the proper functioning of the network device once it's powered up.

The other options do not correspond to valid commands understood by Cisco networking devices. They do not follow the standard command syntax used in the Cisco IOS, which is critical for effective network device management and configuration.