Given the following circuits: O a b Circuit 1 F1 F2 a F3 0 1 2 3 Circuit 2 F1 F2 F3 D Circuit 1 can be used as a comparator for bits X and Y if a = X, b = Y, F1=1 means X=Y, F2=1 means X>Y, F3=1 means X Y, F3=1 means X