Consider the following i/o scenarios on a single-user pc: a. a mouse used with a graphical user interface b. a tape drive on a multitasking operating system (with no device preallocation available) c. a disk drive containing user files d. a graphics card with direct bus connection, accessible through memory-mapped i/o for each of these scenarios, would you design the operating system to use buffering, spooling, caching, or a combination? would you use polled i/o or interrupt-driven i/o? give reasons for your choices.