Test 
for relative maximum and minimum.
?
A. The point 
is a saddle point.
A relative maximum occurs at 
.
B. The point
is a saddle point.A relative maximum occurs at 
.
C. The point
is a saddle point.A relative maximum occurs at 
.
D. The point
is a saddle point.A relative minimum occurs at 
.
E. The point
is a saddle point.A relative minimum occurs at 
.
Answer: B
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y = - 
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C. 
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