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 circuit is

A. S-R Flip-Flop with inputs X = R and Y = S

B. S-R Flip-Flop with inputs X = S and Y = R

C. J-K Flip-Flop with inputs X = J and Y = K

D. J-K Flip-Flop with inputs X = K and Y = J

Answer: Option D