In the context of Disk Scheduling, what does 'seek time' refer to?

1. A.

   The time taken to read/write data

2. B.

   The time taken to move the disk arm to the required track

3. C.

   The time taken for the rotation of the disk to bring the required sector under the disk head

4. D.

   The total time taken to complete a disk I/O operation

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