The graphs labeled (a), (b), (c), and (d) are graphs of the function f(x, y) = -4x/(x² + y² + 1). Match each of the four graphs with the point in space from which the surface is viewed. The four points are (20, 15, 25), (-15, 10, 20), (20, 20, 0), and (20, 0, 0).

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(a) (c) -y Generated by Maple Z Generated by Maple (b) (d) y X X 2 Generated by Maple Generated by Maple