Find all the local maxima, local minima, and saddle points of the function.
A. f(45, 45) = 151,875, local maximum; f(0, 0) = 0, local minimum
B. f(45, 45) = 151,875, local maximum
C. f(9, 5) = 9211, saddle point; f(5, 9) = 6075, saddle point
D. f(0, 0) = 0, local minimum
Answer: D
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