5. Disk requests come in to the disk driver for cylinders 10, 22, 20, 12, 40, 6, and 38, in that order A seek takes 5 mses per cylinder. Calculate (i) how many cylinders disk arm motion and (i) how much seek time is needed for. (a) First-come, first served (b) Closest cylinder next. (c) Elevator algorithm (initially moving upward). In all cases, the arm is initially at cylinder 12