Consider the following graph of the function f(x, y), given below. f(x, y) =4+x+y-3xy 3.2. 3.7. 4.2 3.7 3.2 5 6 Use the level curves to predict the location of the critical points of f and determine whether f has a saddle point, local maximum, or local minimum at each point. Then use derivatives test to confirm your predictions. (If an answer does not exist, enter DUE.) point corresponding to local maximum (x, y) = point corresponding to local minimum (x, y) = point corresponding to saddle point (x, y) =