Ans is (d) because as we know the square sum of direction cosines is 1.... Now from the options i am damn sure the vector is in 3d plane... Therefore gamma must be here.... Now in option d) square sum of these two angles cosines is 1 which is impossible as this vector not in xy plane because sum of angle is not 90.... Yani ki gammma angle yaha par hoga jiski uajah se square of cosines ka sum greater than 1 hoga....