Operating system; Disk Scheduling Algorithms. 1. Assume the read-write head is at cylinder 99 and here are 200 cylinders numbered from 0-199. For the I/O request queue below, what is the total number of head movements when using the following disk scheduling algorithms? Show your work for full credit. 62, 155, 107, 39, 27, 33, 175, 189 a. First-Come-First-Served (FCFS) b. Shortest-Seek-Time-First (SSTF) c. SCAN d. C-SCAN 2. Compare the performance of SCAN and C-SCAN disk scheduling algorithms (in terms of total distance the disk arm moves) and state which one among the two is more preferable