28. Please solve all parts neatly. Thank you

Find all the local maxima, local minima, and saddle points of the given function. f(x,y) = 2x + 3xy + 4y -7x-11y Select the correct choice below and fill in any answer boxes within your choice O A. There are local maxima located at (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed.) O B. There are no local maxima. Select the correct choice below and fill in any answer boxes within your choice. O A. There are local minima located at (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed, O B. There are no local minima. Select the correct choice below and fill in any answer boxes within your choice. A. There are saddle points located at (Simplify your answers. Type ordered pairs. Use a comma to separate answers as needed.) O B. There are no saddle points