What is the primary function of BIOS in a computer system?

The primary function of the BIOS (Basic Input/Output System) in a computer system is to provide support for hardware devices. It acts as an intermediary between the operating system and the hardware components of the computer. Upon startup, the BIOS performs a POST (Power-On Self-Test) to check hardware components like the RAM, CPU, and storage drives, ensuring they are functioning properly. It also initializes and configures system devices, loads the operating system into memory, and provides a set of routines that allow the operating system to interface with the hardware.

This foundational role of the BIOS is crucial for the overall functioning of the computer system, as it enables all hardware components to work together seamlessly. While other functions mentioned, such as managing file storage or controlling video settings, are important, they typically fall under the jurisdiction of the operating system or specific drivers rather than the BIOS itself. Therefore, the correct choice highlights the essential support role that BIOS provides in ensuring hardware compatibility and proper operation within the broader computer system.