[单选题]

A disk scheduling mechanism in an operating system causes the disk arm to sweepbackand forth across the disk Surface servicing all requests in its path．This is a (73) ．(73)
A．First Come First Serve
B．Shortest Seek Time First
C．Scan
D．None of the above

A disk scheduling mechanism in an operating system causes the disk arm to sweepbackand forth across the disk Surface servicing all requests in its path．This is a (73) ．(73) A．First Come First ServeB．Shortest Seek Time FirstC．ScanD．None of the above