Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. f(4, 4) = 521, local maximum
B. f(4, 0) = 9, local minimum; f(0, 4) = 9, local minimum
C. f(0, 0) = 9, saddle point; f(4, 4) = 521, local maximum
D. f(0, 0) = 9, test is inconclusive
Answer: D
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