The radar gun used by a police officer outputs a radar signal and measures the speed of the cars as they pass. However, when the officer wants to ticket an individual for speeding, he must save the measured speed of the car on the radar unit. Build a system to implement a speed save feature for the radar gun. The system has an 8-bit speed input S, an input B from the save button on the radar gun, and an 8-bit output D that will be sent to the radar gun's speed display.