If the formula y=x3 is changed by adding four as shown in red below. Which of the following best describes the resulting change for each of the functions? Function f(x)=x3+4f(x)=(x+4)3 Transformation a. The +4 would directly affect the y-values, so the graph would shift vertically. b. The +4 would have no effect. c. The +4 would directly affect the x-values, so the graph would shift horizonally