Which of the following describes the growth rate of the exponential function in the graph?
A
For each x increase of 1 , the y increases by doubling and then adding 1 .B
For each x increase of 1 , the y increases by a common difference of 3 .C
For each x increase of 1 , the y increases by 4 more than the previous increase.D
For each x increase of 1 , the y increases by a common factor of 3 .