Which choice is the explicit formula for the following geometric sequence? 0.2,-0.06, 0.018, -0.0054, 0.00162,

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.