42. The digital logic shown in the figure satisfies the given state diagram when Q1 is connected to input A of the XOR gate.

Suppose the XOR gate is replaced by an XNOR gate. Which one of the following options preserves the state diagram?

(A)  Input A is connected to \(\overline {Q2}\)

(C)  Input A is connected to \(\overline {Q1} \) and S is complemented

(B) Input A is connected to Q2

(D) Input A is connected to \(\overline {Q1}\)


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