2) (6 Points) Programmed vs. Interrupt-Driven I/O A particular system is controlled by an operator through commands entered from a keyboard. The average number of commands entered in an 8-hour interval is 60. Show your work to receive full credit. Suppose the CPU scans the keyboard every 100ms. How many times will the keyboard be checked in an 8-hour period? a. b. By what fraction would the number of CPU visits to the keyboard be reduced if interrupt-driven I/O were used? 3) (4 Points) DMA Module When a DMA module takes control of a bus, and while it retains control of the bus, what does the processor do