This week's module introduced several concepts such as productivity, industrial, pre-industrial, and post-industrial eras, the Service Process Matrix, etc. Review the following choices, and select the best choice. a. Manufacturing contributes to more than 80% of the current U.S. economy. b. In the Service Process Matrix, the x-axis denotes customization, and the y-axis denotes the volume. c. Smarter (better) processes and technological advances (modernization) facilitated increased productivity in the manufacturing sector. d. The Clark-Fisher model suggests that as productivity grows in one sector, the labor force moves to another sector. e. c and d are true