Question 4 (a) Given that main memory is 64K, a page/frame size is 4K and that a process's virtual memory size is 128K (i) How many entires would a page table in this system contain? (ii) What is the size of the virtual address and a real memory address in this system? (ii) Explain how the memory management unit converts a virtual address into an address in real memory on this system. (b) In a virtual memory management system, under what conditions are inverted page tables needed? How is such a table used