Concept:Input devices send data to the computer, while output devices receive and present data from the computer.Explanation:A speaker produces sound from computer audio, so it is an output device.A mouse inputs cursor movements and clicks.An Optical Character Reader (OCR) scans and inputs text from documents.A digitizer converts touches or pen strokes into digital signals.Hence, the speaker is the only device that does not input data into the computer.Answer:Option B: Speaker.