Find all the local maxima, local minima, and saddle points of the function. f(x,y) = 5xy - 4x² - 5y²+3x+8y-9 Select the correct choice below and, if necessary, fill in the answer boxes to complete y A. A local maximum occurs at (Type an ordered pair. Use a comma to separate answers as needed.) The local maximum value(s) is/are . (Type an exact answer. Use a comma to separate answers as needed.) OB. There are no local maxima.

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