A sequential circuit using D flip-flop and logic gates is

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A sequential circuit using D flip-flop and logic gates is shown in the figure where X and Y are the inputs and Z is the output. The circuits is z

1. S – R FF with inputs X = R and Y = S
2. S – R FF with inputs X = S and Y = R
3. J – K FF with inputs X = J and Y = K
4. J – K FF with inputs X = K and Y = J

Correct Option: D

Comparing from the truth table of J– K FF
Y= J, X = K