Find all relative extrema for the function, and then match the equation to its graph.
z = -y4 + 4xy - 2x2 + 
A. Relative minima of - 
at (0, 1) and
at (0, -1); saddle point at (0, 0)
B. Saddle points at (0, 0), (-1, 1), (1, -1), (1, 1),
and (-1, -1)
C. Relative maxima of 
at (1, -1)
and at (1, 1);
D. Relative maxima of 
at (1, 1)
and at (-1, -1); saddle point at (0, 0)
Answer: D
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A. 
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