Solution

The Correct Answer is Option 2

Key Points

Clustered Page Table (A → III):

• Clustered Page Tables are particularly useful for sparse address spaces, where memory allocation is scattered across different regions instead of being contiguous.
• They help reduce the number of page table entries by clustering multiple pages into a single entry, making them ideal for optimizing sparse memory usage.

Hierarchical Page Table (B → I):

• Hierarchical Page Tables are generally considered inappropriate for 64-bit architectures because they require multiple levels of page tables, which can lead to increased overhead and slower memory access.
• For large address spaces like those in 64-bit systems, alternative approaches such as clustered or inverted page tables are preferred.

Segmentation (C → IV):

• Segmentation supports a user view of the system by dividing memory into different segments such as code, data, and stack segments.
• This approach aligns with the logical organization of programs and is easier for users and programmers to understand and manage.

Inverted Page Table (D → II):

• Inverted Page Tables have only one entry for each real page (or frame) of memory, unlike traditional page tables which have entries for every virtual page.
• This reduces the memory overhead for page tables, making it a more efficient option for larger address spaces.