(a) Explain what virtual memory is and list some of its benefits. (b) Describe what hierarchical (a.k.a. multilevel) and inverted page tables are and compare their mutual advantages. (c) Assume that a computer uses a 32-bit virtual address, byte-level addressing and 4KB pages. i. Determine the maximum size of the virtual address space per process. ii. Compute the size of the single-level page table iii. Calculate the size of the root page table assuming a two-level page table