Let x, y, z be (non-zero) vectors and suppose w = z. If z = 3x - 4y, then w = x+ y. Using the calculation above, mark the statements below that must be true. A. Span(w, z) = Span(w, x, z) B. Span(x, z) = Span(w, x, y) C. Span(w, y, z) = Span(w, x) D. Span(w, y, z) = Span(w, z) E. Span(x, y, z) = Span(x, y)