24. Which of the following statements is true?
(A) The 3D printing technology is made available because of new materials like carbon fiber.
(B) With the easy access of the Internet, ideas can be easily swapped, which makes it easier to start a new manufacturing project.
(C) The new technology will bring an end to all factory jobs; hence operating a machine will no longer be a grimy job.
(D) 3D printing may be smart, but its productivity does not really match its promise.