Disk requests come into the disk driver for cylinders 10, 22, 20, 2, 40, 6, 38 (in that order). A seek takes 4.5 msec per cylinder. How much seek time is needed for each of the following, if the disk arm is initially at cylinder 39? A. First-come, first-served. B. Shortest-seek first. C. Elevator algorithm (initially moving upward).

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