need location of saddle points for this

Find the relative maximum and minimum values and the saddle points. f(x,y) = 288y + x2 - x2y Find the relative maximum. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. There are relative maxima at (Type an ordered pair. Use a comma to separate answers as needed.) O B. There are no relative maxima. 4 Find the relative minimum. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. There are relative minima at (Type an ordered pair. Use a comma to separate answers as needed.)