Final answer:
The keyboard, scanner, and mouse are input devices while the rest are output devices.
Step-by-step explanation:
Input devices are devices that allow users to input data or commands into a computer system. From the given options, the following are input devices:
- Keyboard: A keyboard allows users to enter text and commands by pressing keys.
- Scanner: A scanner allows users to input physical documents or images into a computer system.
- Mouse: A mouse allows users to move a cursor on the screen and select options.
The other options mentioned, such as speaker, display, printer, and monitor, are output devices that display or produce information from the computer system.