Which one is a unit vector ?

A. ??3 i^ + ??3 j^ + ??3 k^

B. 1/??3 i^ + 1/??3 j^ +1/ ??3 k^

C. ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^

D. Both B and C are correct

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