Which best describes the graph of the function f(x) = 4(1.5)x? a. the graph passes through the point (0, 4), and for each increase of 1 in the bx-values, the y-values increase by 1.5. b. the graph passes through the point (0, 4), and for each increase of 1 in the x-values, the y-values increase by a factor of 1.5. c. the graph passes through the point (0, 1.5), and for each increase of 1 in the x-values, the y-values increase by 4. d. the graph passes through the point (0, 1.5), and for each increase of 1 in the x-values, the y-values increase by a factor of 4.