When the function f(x) = 4(2)x is changed to f(x) = 4(2)x − 13, what is the effect? (5 points) Select one:
a. There is no change to the graph because the exponential portion of the function remains the same.
b. The x-intercept is 13 spaces higher.
c. The y-intercept is 13 spaces lower.
d. All input values are moved 13 spaces to the left.