Question: In realization of the following closed - loop counter using D - FF , how many Flip Flops is needed? ( 0 0 = >

In realization of the following closed-loop counter using D-FF, how many Flip Flops is needed?
(00=>1=>2=>3=>4=>5=>6=>7=>6=>5=>4=>3=>2=>1=>0
A.
5 Flip Flops
B.
4 Flip Flops
C.
3 Flip Flops
D.
None of them

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