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