# 42. The digital logic shown in the figure sati...

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?

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

(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

Hint:
Explanation:

Answer-(D) Input A is connected to $\overline {Q1}$
Discuss the solution.