Q. The flip-flops which has not any invalid states are
A
S-R, J-K, D
B
S-R, J-K, T
C
J-K, D, S-R
D
J-K, D, T
Solution:
Unlike the SR latch, these circuits have no invalid states. The SR latch or flip-flop has an invalid or forbidden state where no output could be determined.