64.
The answer is: D
Explanation
Answer: D) Mouse, Keyboard, Scanner
Device Classification:
| Device | Type |
|---|---|
| Mouse | Input ✓ |
| Keyboard | Input ✓ |
| Scanner | Input ✓ |
| Monitor | Output ✗ |
| Printer | Output ✗ |
| Plotter | Output ✗ |
Why other options are wrong:
| Option | Problem |
|---|---|
| A | Monitor is an output device |
| B | Printer is an output device |
| C | Plotter is an output device |
| D | All three are input devices ✓ |
Key Concept:
- Input devices → send data into the computer (Mouse, Keyboard, Scanner, Microphone, Webcam)
- Output devices → send data out of the computer (Monitor, Printer, Plotter, Speakers)
Scanner inputs physical documents into the computer - making D the only all-input group.