Which statement best describes the primary role of an operating system?

Which statement best describes the primary role of an operating system?

• A. Manages hardware and software resources and provides common services for programs
• B. Manages only memory
• C. Runs applications directly without OS
• D. Is optional for most computers

Answer: (A)

An operating system coordinates hardware and software resources and provides common services that programs rely on. It acts as a manager and mediator between applications and the computer’s components, allocating CPU time, memory, and I/O devices, while keeping programs isolated from each other and from the hardware. It also offers essential services such as file management, device drivers, networking, and security, presenting a consistent interface so software can run without needing to know hardware specifics. This combination enables multitasking, efficient resource use, and safe, stable operation of all programs. The other statements are narrower or incorrect: focusing only on memory misses the broader role of scheduling, I/O handling, and service provision; running applications directly without an OS isn’t how modern computers operate; and the OS is not optional for typical computers since some management layer is needed to coordinate resources and services.

An operating system coordinates hardware and software resources and provides common services that programs rely on. It acts as a manager and mediator between applications and the computer’s components, allocating CPU time, memory, and I/O devices, while keeping programs isolated from each other and from the hardware. It also offers essential services such as file management, device drivers, networking, and security, presenting a consistent interface so software can run without needing to know hardware specifics. This combination enables multitasking, efficient resource use, and safe, stable operation of all programs.

The other statements are narrower or incorrect: focusing only on memory misses the broader role of scheduling, I/O handling, and service provision; running applications directly without an OS isn’t how modern computers operate; and the OS is not optional for typical computers since some management layer is needed to coordinate resources and services.