Function g is a transformation of rational function f. For both functions, as x approaches either -infinity or positive infinity, the value of the function approaches 0. Which equation could represent function g?

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.