A. Shortest-Seek-time-first scheduling
B. small – small-time-first
C. simple-seek-time-first
D. small-simple-time-first scheduling

Solution

A. Shortest-Seek-time-first scheduling

Explanation

The full form of SSTF is Shortest Seek Time First. SSTF is a secondary storage scheduling algorithm that determines the motion of the disk's head and arm in servicing the read and write requests. SSTF acts as a disk scheduling algorithm, and it is an improvement upon the FCFS algorithm.