Let x, y, z be (non-zero) vectors and suppose w = 15x15y + 4z. x+ Y. If z = 3y - 3x, then w = Using the calculation above, mark the statements below that must be true. A. Span(w, z) = Span(x, y, z) B. Span(w, x, y) = Span(w, y, z) C. Span(y, z) = Span(x, y, z) D. Span(x, z) = Span(w, z) E. Span(w, x) = Span(x, y)