Let ABCD be a tetrahedron, where A= (2,0,0), B = (0,4,0). If edge CD lies on line x -1/1 = y - 2/2 = z - 3/3 , such that centriod (α,β,γ) of tetrahedron satisfies 2α - 5/2/1 = β - y_{1}/a_{ }= y - z_{1}/b then which of the following are CORRECT?

(A) a + b = 5/2

(B) y_{1} + z_{1} = 19/4

(C) y_{1} - z = 1/4

(D) a + b + y_{1} = 5