Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers > 0; level curves: ellipses 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
C. Domain: all points in the xy-plane except (0, 0); range: real numbers > 0; level curves: ellipses 
D. Domain: all points in the xy-plane except (0, 0); range: all real numbers; level curves: ellipses 
Answer: C
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