What do ship store personnel use for diagnostics on the CAD device?

Ship store personnel utilize the CAD buttons for diagnostics on the CAD device because these buttons are specifically designed to facilitate the testing and troubleshooting of the system. When personnel press the CAD buttons, they can access various functions and diagnostic information that are essential for ensuring the reliable operation of the device. This includes checking the status of transactions, monitoring system performance, and performing necessary adjustments or maintenance checks.

The other options, while relevant to the device, do not serve the specific purpose of diagnostics in the same way that CAD buttons do. Diagnostic software typically requires separate emphasis on software issues rather than hardware interactions, and while the control panel may provide some operational insights, it is the CAD buttons that directly interact with the diagnostic protocols integrated within the device. Hence, utilizing the CAD buttons enhances the efficiency of ship store personnel in maintaining the operational integrity of the CAD system.