How does D-flip flop gets generated from J-K Flip-Flop ?

How does D-flip flop gets generated from J-K Flip-Flop ?

a. By connection of NOT gate between J & K flip-flop---
b. By connection of OR gate between JK flip-flop
c. By connection of NOT & OR between JK flip-flop
d. None of them

Correct Answer : a. By connection of NOT gate between J & K flip-flop

Explanation :

Just after the insertion of NOT gate between the JK flip-flop, it exhibits the delay by changing output states from 0 to 1 & 1 to 0.