(1 point) let x, y, z be (non-zero) vectors and suppose w = 3x + 2y – z. if z = -3x – 2y, then w = 6 x + using the calculation above, mark the statements below that must be true. a. span(w, x, y) = span(w, y, z) b. span(w, z) = span(w, x) c. span(w, x, z) = span(x, y, z) d. span(w, x) = span(y, z) e. span(x, y) = span(w, z)