Let w, x, y, z be vectors and suppose z = x - 4y and w = - -2x - 4y + 2z. Mark the statements below that must be true. A. Span(x, y)=Span(w) B. Span(y, w)= Span(z) C. Span(y) = Span(w) D. Span(x, y) = Span(x, w, z)

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