Find all points (x,y) where f(x,y) = x" - 4xy + 2 W H + 9 has a possible relative maximum or minimum. Where do the possible maximums or minimums occur in a function? of of O A. At points (a,b) where (a,b) = 0 and (a,b) = 0 of of O B. At points (a,b) where ox (a,b) 0 and (a,b) > 0 of of O D. At points (a,b) where ax (a,b) = 1 and (a,b) = 1A delivery company requires that any box delivered must have a length plus girth (distance around) totaling no more than 120 inches. Find the dimensions of the box with maximum volume that can be sent. [Note: Using the figure to the right, 120 = {length + girth) = z + [2x + 2y).] The dimensions of the box with maximum volume that can be sent are D inches. (Simplify your answer. Use a comma to separate answers as needed.)