Q.3. Answer the following questions d. (5 points) A computer has 4 Gbyte main memory, where each memory word is 32 bits. How bits are there in a memory address? e. ( 6 points) In a virtual memory system, virtual addresses are 32 bits and physical addresses are 24 bits. Page size is 1024 words. How many pages are there in the virtual memory? How many bits in the main memory address are used as the page frame number? r. (s points) Three disk units ( D1,D2,D1) and two printers (P1,P2) are connected to a computer, Disks are connected as a daisy chain where D,is is elosest to the CPU, Printers are also connected as a daisy chain where P1 is closest to the CPU. Disk group has higher priority than printer group. If D3 and P1 send interrupt request at the same time, which one will be handled? Why? B. (5 points) In a control memory 8 control words are allocated for each execute routine. Execute routines are placed in the first balf of the control memory. Opeodes are 5 bits. Design the mapping and write the starting address of the routine which has opcode 10011 . h. (8 points) A computer has a main memory with 4 page frames. A process references the following pages in the given order: Page numbers: A, B, C,B, C, D, C, D, E