In the illustration circuit, A, B, C, and D are each 12 volts. What is the voltage at the output lead connected to 'A' and 'B' with respect to the output lead connected to 'C' and 'D'? EL-0039 A. (+) 48 volts B. (-) 24 volts C. (-) 48 volts D. (+) 24 volts