Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. f(-10, -10) = 19,994, local maximum
B. f(-10, 0) = -6, local minimum; f(0, -10) = -6, local minimum
C. f(0, 0) = -6, saddle point
D. f(0, 0) = -6, saddle point; f(-10, -10) = 19,994, local maximum
Answer: C
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