Find all local extrema for the function f(x.y) = 7x2 9xy - ivy2 + 144x + 109y + 4. *~_ . Select the correct choice below and ll in any answer boxes within your shares. O A- There are local maxima located at i". . (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed.) 0 B. There are no local maxima. Select the correct choice below and ll in any answer boxes within your choice. 0 A- There are local minima located at I. (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed.) 0 B. There are no local minima. Select the comet choice below and ll in any answer boxes within your choice. 0 A- There are saddle points located at I. (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed.) - O B. There are no saddle points