单选题：Suppose we have a disk cluster with 8 equal-size disks. And we c

Suppose we have a disk cluster with 8 equal-size disks. And we can select raid 0, raid 1 or raid 5 for the cluster. Consider a file has 100 data blocks. Assume that the file control block, the index block(s) are all in memory. Which of the following actions does not require any I/O operations?@[B](1)
A. moving the last block to the beginning, if contiguous allocation method is used
B. moving the last block to the beginning, if indexed allocation method is used
C. moving the last block to the beginning, if linked allocation method is used
D. moving the first block to the end, if linked allocation method is used





A.moving the last block to the beginning, if contiguous allocation method is used
B.moving the last block to the beginning, if indexed allocation method is used
C.moving the last block to the beginning, if linked allocation method is used
D.moving the first block to the end, if linked allocation method is used


答案：B