The correct answer is: B. Operating system
The operating system is the first program run on a computer when the computer boots up. It is responsible for managing the computer’s hardware and software resources, and for providing a user interface.
System software is a general term for software that is used to control the operation of a computer or other electronic device. It includes the operating system, as well as other programs that are necessary for the computer to function properly.
System operations are the tasks that are performed by the operating system to manage the computer’s hardware and software resources. These tasks include loading and unloading programs, managing memory, and controlling input and output.
None of the other options are correct.