5. For a computer architecture with multi-level paging, a page size of 4 KB, and 64-bit physical and virtual addresses: 1. List the required and optional fields of its page table entry, along with the number of bits per field. 2. Assuming a compact encoding, what is the smallest possible size for a page table entry in bytes, rounded up to an even number. 3. Assuming a requirement that each page table fits into a single page, and given