In the following sequence -r indicates that a block is read and -w indicates tha

Question

In the following sequence -r indicates that a block is read and -w indicates that a block is written. A direct-mapped cache holds 4 blocks and write-back is done. Which describes the first write-back in the following sequence? The numbers are block numbers, not addresses, so block size is not considered in this question. 3-r, 7-w, 11-r, 11-w, 3-w A- On the second access to block 3, block 11 needs to be written back to main memory. B- On the second access to block 11, block 11 needs to be written back to main memory C- Before block 7 is placed in the cache, block 3 needs to be written back to main memory D- Before block 11 is placed in the cache, block 7 needs to be written back to main memory

Explanation / Answer

11.

Option b is correct choice.

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