The potentiometers shown in the illustration are supplied with both (+) and (-) voltages as well as a reference to ground ________________. EL-0095 A. so there is always a spare power supply on standby which is grounded for safety B. because one supply is for pitch command, the other for lever illumination at night and the potentiometers are in positions where they can be accidentally touched C. to command or indicate pitch direction in addition to amount of pitch D. because one supply is for pitch command, the other for relay operation and the potentiometers are in positions where they can be accidentally touched