Let vector α = i + j + k, vector β = i + j + k and vector γ = i + j + k be three vectors. A vector δ , in the plane of vector α and vector β, whose projection on vector γ is 1/√3, is given by
(A) i + 3j + 3k
(B) i + 3j + 3k
(C) i + 3j + 3k
(D) i + 3j + 3k
