Solution

The correct answer is It provides lower degree of multiprogramming..

Key Points

• Virtual memory segmentation is a memory management technique that divides the memory into different segments, each segment being a logical unit such as a function, object, or data structure.
• Option 1: It is not necessary to load all of the segments of a process. This is correct because virtual memory allows for the loading of only the necessary segments into physical memory, leaving the rest on disk until needed.
• Option 2: It has no internal fragmentation. This is correct because segmentation divides memory into variable-sized segments, which avoids internal fragmentation as opposed to fixed-sized paging.
• Option 3: It has large virtual address space. This is correct because segmentation can make use of a large virtual address space, allowing processes to address more memory than physically available.
• Option 4: It provides lower degree of multiprogramming. This is incorrect. Virtual memory segmentation actually allows for a higher degree of multiprogramming by enabling more processes to reside in memory simultaneously, as not all segments need to be loaded at once.

Additional Information

• Segmentation is often combined with paging to provide the benefits of both techniques.
• Virtual memory allows for the execution of processes that may not be completely in the physical memory, thus efficiently utilizing the available physical memory.
• Internal fragmentation occurs when fixed-sized memory blocks are allocated to processes, leading to wasted space within the allocated blocks. Segmentation avoids this by using variable-sized segments.