How would I solve this?

Section 11.7: Problem 4 (1 point) Suppose f(x, y) - 22 + 2 - 42 - 4y + 2 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. (C) If there is a local maximum, what is the value of the discriminant D at that point? If there is none, type 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. (E) What is the maximum value of f on R.2? If there is none, type N. (F) What is the minimum value of f on R.2? If there is none, type N. arn partial credit on this