External clock is to be provided

It is more complex

Both (a) and (b)

Generally they involve stability problem

Comparator circuit

Demultiplexer

Frequency to voltage converter

Voltage to frequency converter

2

5

6

8

clock input of all flip-flops

clock input of one flip-flops

J and K inputs of all flip-flops

J and K inputs of one flip-flop

10

12

16

32