Given the following equation of an exponential function determine the base, b, of the exponential model. Is the base a growth or decay factor? a. b is 0.6394; It is a growth factor. b. b is 0.6394; It is a decay factor. c. b is 20.5; It is a growth factor. d. b is 20.5; It is a decay factor. Please select the best answer from the choices provided