Assume there is a file which consists of 20 blocks. Consider that the file-control block is already stored in the memory. Calculate the number of disk I/O operations are required for contiguous and linked allocation strategies, if, for one block, the following conditions hold. Also assume that the block information to be added is stored in memory.
a. The block is added at the beginning.
b. The block is added in the middle.
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c. The block is added at the end.
Note: Make suitable diagrams to illustrate the complete process rather than writing the direct results or answers.