For each of the following functions, find the maximum and minimum values of the function on the circular disk: z² + y² ≤ 1. Do this by looking at the level curves and gradients. (A) f(x, y) = x+y+2: maximum value = 2+1/8^(1/2) minimum value = (B) f(x, y) = 2x² + 3y² maximum value= minimum value= (C) f(x, y) = 21²-3y² maximum value= minimum value=