Which of the following best describes an input device?

An input device is defined as a hardware component that allows users to enter data into a computer system. This includes devices such as keyboards, mice, scanners, and microphones, which facilitate the transfer of information from the user to the computer. The primary function of these devices is to capture user input and convert it into a format that the computer can process, ultimately enabling interaction with software applications and systems.

The other options describe different functions: the first option pertains to output devices that present information to the user, like monitors and printers. The third option relates to processing devices, which manipulate or transform data, such as the CPU. The last option mentions software applications that manage files, which do not pertain to the input process at all. Therefore, the choice that best encapsulates the definition and role of an input device is accurately identified.