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) = ln ( 7x + 10y)

A) Domain: all points in the xy-plane; range: all real numbers; level curves: lines 7x + 10y = c

B) Domain: all points in the xy-plane satisfying 7x + 10y > 0; range: all real numbers; level curves: lines 7x + 10y = c

C) Domain: all points in the xy-plane satisfying 7x + 10y ≥ 0; range: all real numbers; level curves: lines 7x + 10y = c

D) Domain: all points in the xy-plane satisfying 7x + 10y > 0; range: real numbers z ≥ 0; level curves: 7x + 10y = c lines