A 4 bit synchronous counter uses flip-flop with propagation

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A 4 bit synchronous counter uses flip-flop with propagation delay time of 25 ns each. The maximum possible time required for change of state will be—

1. 25 ns
2. 50 ns
3. 75 ns
4. 100 ns

Correct Option: D

Total propagation delay = 25 × 4 ns = 100 ns