Let s ={v,, v2» v3, v, v be a set of vectors in r, where v, = (1, 2,-2, 1), v, = (-3, 0, 4, 3), v = (2, 1, 1, -1), v, = (-3, 3, -9, 6), and v, = (9, 3, 7, -6).

Let S ={v,, V2» V3, V, V be a set of vectors in R, where v, = (1, 2,-2, 1), v, = (-3, 0, 4, 3), V = (2, 1, 1, -1), v, = (-3, 3, -9, 6), and v, = (9, 3, 7, -6). 12. Find a subset of S that is a basis for W = span S. (B) V v} v,, V, {v,. V (C) V, V (A) (D)