Find the local maxima and local minima of the function shown below. f(x,y) =x2 + y2-20x+18y-7 What are the local maxima? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. Local maxima are located at (Type an ordered pair. Use a comma to separate answers as needed.) O B. There are no local maxima. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The local maxima are f= (Simplify your answer. Use a comma to separate answers as needed.) O B. There are no local maxima. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. Local minima are located at (Type an ordered pair. Use a comma to separate answers as needed.) O B. There are no local minima. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The local minima are f =. (Simplify your answer. Use a comma to separate answers as needed.) O B. There are no local minima