When arriving at an intersection "on flash," the first act after opening the cabinet door is to: A. push the reset button on the conflict monitor unit. B. observe the controller indicator lights. C. observe the conflict monitor unit indicator lights. D. check the line voltage.Upon arriving at a traffic signal on flash, you open the front door and find the "Watchdog" light is lit on the conflict monitor unit. What is most likely the problem? A. Defective 24 VDC supply B. Defective controller unit C. The program card is not properly seated in the conflict monitor unit D. Burnt out field indication