A parallelogram is constructed on the vectors 3vector(α - β), b = vector(α + 3β), if vector|α| = vector|β| = 2 and angle between vectorα and vectorβ is π/3, then length of a diagonal of the parallelogram is
or
(a) 4√5
(b) 4√3
(c) 4√17
(d) None of these
