Peripheral devices are used to:

Peripheral devices are designed to enhance user access and expand the functionalities of a computer system. These devices include items such as printers, scanners, external hard drives, and input devices like keyboards and mice. They serve to augment the capabilities of the main computer by providing additional methods to input data, output information, or storage options, thus improving overall usability and efficiency.

For example, a printer allows the user to produce physical copies of documents, while a scanner can transform physical documents into digital format for easier management and storage. By integrating these devices, users can interact with and utilize the computer in a more versatile manner, indicating their role in enhancing functionality and user experience.

In contrast, other choices do not accurately reflect the primary role of peripheral devices. While some might contribute to aspects like data storage or security, those functionalities are not the core purpose of peripheral devices. Therefore, the answer highlighting the enhancement of user access and expansion of computer functions captures the essence of what peripheral devices are intended for.