Assume that the head of a moving-head disc has 200 tracks numbered 0 to 199 and is currently serving a request at track 100. In FIFO order, the pending requests are: 23, 89, 132, 42, and 187. For each...

Assume that the head of a moving-head disc has 200 tracks numbered 0 to 199 and is currently serving a request at track 100.

In FIFO order, the pending requests are: 23, 89, 132, 42, and 187.

For each of the following disk-scheduling techniques, what is the total number of head movements (in cylinders)?