Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. (-4, -7); local maximum; (4, 7) local minimum
B. (4, -7); saddle point; (-4, 7); saddle point
C. (4, 7); local minimum; (4, -7); saddle point; (-4, 7); saddle point; (-4, -7); local maximum
D. (-4, -7); local maximum
Answer: C
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