Explanation:

The task is to identify the item that does not belong to the same category as the others. UNIX, MS-DOS, and WINDOWS $\text{98}$ are all examples of operating systems, which manage computer hardware and software resources. **ACCESS** is fundamentally different. * **Option A (UNIX):** A family of multitasking, multi-user operating systems. * **Option B (MS-DOS):** A single-user, single-tasking operating system. * **Option C (WINDOWS 98):** A graphical operating system by Microsoft. * **Option D (ACCESS):** This is the correct answer. Microsoft Access is a database management system (DBMS) application, not an operating system.