Find all the local maxima, local minima, and saddle points of the function. f(x.y) = - 4x - 4xy – 7y° + 80x + 136y + 9 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O 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.) O B. There are no local maxima. sise helow ond SUE shsise

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