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(1 point) Suppose f(z, y) = z2 + y? - 2z - 4y + 5 (A) How many critical points does f have in R2? (B) If there is a local minimum, what is the value of the discriminant D at that point? If there is none, type N. 4 (C) If there is a local maximum, what is the value of the discriminant D at that point? If there is none, type N. N (D) If there is a saddle point, what is the value of the discriminant D at that point? If there is none, type N. N (E) What is the maximum value of f on IR? If there is none, type N N (F) What is the minimum value of f on IR? If there is none, type N.Previous Problem Problem List Next Problem (1 point) Find the coordinates of the point (x, y, z) on the plane z = 3 x + 4 y + 4 which is closest to the origin. X = V = Z =(1 point) Suppose f(z, y) = zy(1 - 51 - 4y) f(x, y) has 4 critical points. List them in increasing lexographic order. By that we mean that (x, y) comes before (z, w) if I