A 4 bit ripple counter and a 4 bit synchronous counter are

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A 4 bit ripple counter and a 4 bit synchronous counter are made using flip-flop having a propagation delay of 10 ns each. If the worst delay in the ripple counter and the synchronous counter be R and S respectively, then—

1. R = 10 ns, S = 40 ns
2. R = 40 ns, S = 10 ns
3. R = 10 ns, S = 30 ns
4. R = 30 ns, S = 10 ns

Correct Option: B

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