If cosx + cosy + cosz = 0 = sinx + siny...

If `cosx + cosy + cosz = 0 = sinx + siny + sinz`,then possible value of `cos((x-y)/2)` is (A) `4``3``1``2` (B) `4``3``2``1` (C) `3``4``2``1` (D) `3``4``1``2`

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