(A) Compiling code
(B) Managing hardware and software resources
(C) Managing applications resources
(D) Managing software resources
The answer is: (B) Managing hardware and software resources
The main function of an operating system (OS) is to act as an intermediary between the user and the computer’s hardware. It manages all the computer’s resources, including the central processing unit (CPU), memory, storage, and input/output devices. The OS ensures that different programs and applications can run smoothly and securely without interfering with each other.