What are the four main layers of a computer?

The four main layers of a computer indeed include hardware, software, operating system, and users.

To elaborate, hardware refers to the physical components of a computer system, such as the CPU, memory, and storage devices, which provide the essential building blocks for computing tasks. Software consists of the programs and applications that execute specific functions and enable users to interact with the hardware. The operating system acts as the intermediary between the hardware and software, managing resources and providing a user interface, while ensuring that software applications can efficiently utilize the hardware without conflict. Finally, users represent the end recipients of a computer system’s functionalities, directly interacting with the operating system and installed software to perform tasks.

This combination effectively encapsulates the functional structure of a computer, each layer contributing to the system's overall operation and usability. The other options do not accurately represent these critical layers in the context of a computer system as they either omit key components like the operating system or introduce mismatched concepts such as cloud or services which are not fundamental layers of a computer's architecture.