Which of these is an example of an input device?

To determine which of the options is an example of an input device, you need to understand what an input device is. An input device is any hardware device that allows users to input data or commands into a computer or electronic device.

Now, let's go through each option to find the input device:

1. Monitor: A monitor is an output device that displays visual output from the computer. It does not take any input, so it is not an input device.

2. Keyboard: The keyboard is an example of an input device. It allows users to enter text, numbers, and commands into a computer by pressing keys.

3. Printer: A printer is an output device that prints physical copies of documents or images. It does not take any input, so it is not an input device.

4. Speakers: Speakers are also output devices that produce sound or audio. They do not take any input, so they are not input devices.

From the options given, the keyboard is the only one that matches the definition of an input device. Therefore, the correct answer is the keyboard.