Refer to the drawing of a tank with a differential pressure (D/P) level detector (see figure below). If the tank contains 30 feet of water at 60F, what is the approximate D/P sensed by the detector? A. 2 psid B. 13 psid C. 20 psid D. 28 psid TANK OPEN TO ATMOSPHERE WATER D/P DETECTOR .TANK DIFFERENTIAL PRESSURE LEVEL DETECTOR