Find the Domain and Range and Describe the Level Curves

Multiple Choice

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 satisfying x² + y² = 100; range: real numbers 0 ≤ z ≤ 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ≤ 10

B) Domain: all points in the xy-plane satisfying x² + y² ≤ 100; range: real numbers 0 ≤ z ≤ 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ≤ 10

C) Domain: all points in the xy-plane; range: real numbers 0 ≤ z ≤ 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ≤ 10

D) Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0,0)