Question 1.9: [5 Minutes and 5 Points] Consider the following I/O scenarios on a single-user PC: a. A mouse used with a graphical user interface. b. A hard drive on a multitasking operating system. c. A disk drive containing user files. d. A graphics card with direct bus connection. For each of the above I/O scenarios, would you use polled 1/O, or Interrupt-Driven I/O or DMA? Give reasons for your choices and How does DMA increase the concurrency?.