Explanation:

- Hardware: These are the physical components of a computer system, like the CPU, RAM, and hard drive. Hardware needs instructions to perform tasks.

- Operating System: This system software manages computer hardware and software resources and provides services for computer programs. It's essential for the operation of a computer system.

- Software: ?? Correct Answer: Software instructs the computer hardware on what to do and how to do it. This includes both system software (like operating systems) and application software (programs that perform tasks for users).

- Device Driver: This specialized software helps the operating system communicate with hardware devices.