As shown in figure "A" of the illustration, what input conditions are required to produce an output? EL-0241

Correct Answer: Option C — Either "Input 1" or "Input 2" must be closed OR both "Input 3" and "Input 4" must be closed.

Branch analysis shows parallel connections of Input 1 and Input 2 form an OR relationship, while series connections of Input 3 and Input 4 form an AND relationship. Thus, either Input 1 or 2 must close, or both Inputs 3 and 4 must close.