A vector of magnitude 2 along a bisector...

A vector of magnitude 2 along a bisector of the angle between the two vectors `2hati-2hatj+hatk and hati+2hatj-2hatk` is (A) `2/sqrt(10)(3hati-hatk)` (B) `2/sqrt(23)(hati-3hatj+3hatk)` (C) `1/sqrt(26) (hati-4hatj+3hatk)` (D) none of these

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