Correct Answer:
Option D - Mike, Loudspeaker and Amplifier used for recording sounds or for making voice louder, while Projector is a piece of equipment for projecting photographs, movies or computer slides onto a screen. Hence, option (d) is different one.
D. Mike, Loudspeaker and Amplifier used for recording sounds or for making voice louder, while Projector is a piece of equipment for projecting photographs, movies or computer slides onto a screen. Hence, option (d) is different one.