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 where X and Y are inputs and Z is output. The circuit is—

1. S-R flip-flop with input X = R; Y = S
2. S-R flip-flop with input X = S; Y = R
3. J-K flip-flop with input X = J; Y = K
4. J-K flip-flop with input X = K; Y = J

Correct Option: D

For D to JK conversion
Qn + 1 = JQ + KQ …(i)
But according to the given figure
Z= XQ + YQ …(ii)
comparing eqn. (i) and (ii), we get
⇒ X = K and Y = J

Hence alternative (D) is the correct answer.