86. An exchange student in Europe calls a friend in Boston. The call travels through a fiberoptic cable under the ocean. Which of the following components of the communications system converts the student’s voice into light pulses that can be carried through the fiberoptic cable?
88. The owners of a grocery store chain have decided to try a hand-held bar code scanner for customers to use as they shop. After developing the prototype of the hand-held bar code scanner, what is the next step in the new product development?