Which of the following is a normal vector to the tangent plane to the surface defined by f(x, y) = 10 – 2? – y at the point P = (2, 1, 5)? Oa. There is no tangent plane to the surface at Pbecause Pis not on the surface. Ob. (2, 1, – 1) OC (4,2, –1) od. (-4, 2, 10) Oe. (8, 4, 2)

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