Unsegmented unpaged memory (A): In this type of memory, the virtual address is the same as the physical address, and no paging or segmentation is done. So, the correct match is (A) - (III). Unsegmented paged memory (B): Memory is viewed as a collection of logical address spaces, and paging is used to divide the address space. The correct match is (B) - (II). Segmented unpaged memory (C): Memory is divided into segments, and there is no paging. Virtual memory is viewed as a collection of segments. The correct match is (C) - (IV). Segmented paged memory (D): Memory is divided into both segments and pages. This means that memory is viewed as a paged linear address space. The correct match is (D) - (I). Thus, the correct option is: 1.(A) - (III), (B) - (II), (C) - (IV), (D) - (I).