Let `veca=hati+2hatj +hatk, vec=hati-hatj+hatk and vecc=hati+hatj-hatk`. A vector in the plane of

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Let `veca=hati+2hatj +hatk, vec=hati-hatj+hatk and vecc=hati+hatj-hatk`. A vector in the plane of `veca and vecb` whose projection on `vecc is 1/sqrt(3)` is (A) `4hati-hatj+4hatk` (B) `hati+hatj-3hatk` (C) `2hati+hatj-2hatk` (D) `4hati+hatj-4hatk`
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