Using the calculation above, mark the statements below that must be true. A. Span(x, z) = Span(w, x, y) B. Span(w, x, z) = Span(y, z) C. Span(w, z) = Span(w, x, z) D. Span(w, x) = Span(w, z) E. Span(w, y, z) = Span(w, x)