Which of the following is NOT a type of system software?

The choice of a word processor as the correct answer is appropriate because word processors are classified as application software rather than system software. Application software refers to programs designed to perform specific tasks for users, such as creating documents, managing spreadsheets, or facilitating presentations. Examples of popular word processors include Microsoft Word and Google Docs, which focus on enabling user productivity.

On the other hand, system software serves as the foundational layer of software that manages hardware resources and provides a platform for running application software. Operating systems, such as Windows or macOS, are vital examples of system software as they manage computer resources and facilitate interactions between the user and the hardware. Antivirus programs also fit under system software because they provide essential security functions to protect the computer's operating system. Utility tools, such as disk management applications and backup software, are further examples of system software that help maintain and optimize the performance of a computer system.