A counter that has a modulus of 64 should use a minimum

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A counter that has a modulus of 64 should use a minimum of—

1. 6 flip-flops
2. 6 J-K type flip-flops
3. 6 D flip-flops
4. 64 flip-flops

Correct Option: A

A counter that has a modulus of 64 should use a minimum of 6 flip-flops.
We know that
2^n-1 < N ≤ 2ⁿ
where,
N = No. of states or modulus
n = No. of flip-flops
Therefore,
64 ≤ 2ⁿ
Gives;
n = 6