Which of the following is a fourth root ...

Which of the following is a fourth root of `frac{1}{2}+i frac{sqrt3}{2}` ?

A

`cos(frac{pi}{2}+isinfrac{pi}{2})`

B

`cos(frac{pi}{12}+isin{pi}{12})`

C

`cos(frac{pi}{6}+isinfrac{pi}{6})`

D

`cos(frac{pi}{3}+isinfrac{pi}{3})`

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