5. Which of the following types of operating systems does Unix^circ belong to? A.Real-time operating systems (RTOS) B. Single-use r, single task operating systems C. Single-user multi-tasking operating systems D. Multi-user operating systems

The correct answer is D. Multi-user operating systems.<br /><br />Unix is a multi-user operating system, which means it can support multiple users simultaneously. It is designed to allow multiple users to access the system and run applications at the same time. Unix is also a multi-tasking operating system, which means it can execute multiple tasks or processes simultaneously. This makes it suitable for handling multiple users and their respective tasks efficiently.