Which of the following is classified as an input device?

The classification of a device as an input device is based on its primary function in a computer system. An input device is responsible for sending data to the computer, allowing users to interact with it and providing the system with the data needed to perform tasks.

A webcam is primarily used to capture video and images, which it then sends to the computer. This data can be used for video conferencing, streaming, or digital media creation, making the webcam a clear example of an input device.

In contrast, a printer outputs data from the computer, producing physical documents or images; a monitor displays visual output, rendering information and graphics for the user to view; a speaker plays sound, outputting audio data. These devices do not send data into the computer system but rather present or reproduce data already processed by it. Therefore, the webcam is solely classified as an input device, while the others function primarily as output devices.