The responsibilities of processing, input, and output primarily fall under operating system software. The operating system manages the hardware and software resources of the computer, facilitating communication between the user, application software, and hardware.
- Application software refers to programs designed to perform specific tasks for users, such as word processing or web browsing.
- Middleware is software that acts as a bridge between different applications or between applications and databases.
- Hardware refers to the physical components of a computer system.
Therefore, the correct answer is operating system software.