(1 point) For each of the following functions, find the maximum and minimum values of the function on the circular disk: x? + y < 1. Do this by looking at the level curves and gradients. (A) f(x, y) = x+ y+ 1 maximum value = minimum value = (B) f(x, y) = lr? + 22 maximum value = minimum value = (C) f(x, y) = lr? - 2 maximum value = minimum value =