Find all local maxima, local minima, and saddle points for the function f(x,y) = 4e7xy. Where does the function f(x,y) = 4e7xy have local maxima? Select the correct choice below and fill in any answer boxes within your choice. A. The function has local maxima at (Type an ordered pair. Use a comma to separate answers as needed.) OB. The function has no local maxima. What are the values of the local maxima? Select the correct choice below and fill in any answer boxes within your choice. OA. The values of the local maxima are (Simplify your answer. Use a comma to separate answers as needed.) OB. The function has no local maxima.