Consider the following parameters of a virtual memory system: 48-bit virtual address, an 8GiB of DDR4 DRAM main memory, page size of 4KiB, and page table entry size of 4 bytes. 1) For a single-level page table, how many page table entries (PTEs) are needed? 2) What is the size of the page offset? 3) How much physical memory is needed for storing the page table