Final Answer:
With t = 10 and approach 1, the average number of blocks that must be accessed to find a file entry and read all attributes is 12 blocks. (Option a)
Step-by-step explanation:
Approach 1:
Each directory entry consists of a file name and all attributes associated with the file.
To find a file entry, the system needs to access the block containing the entry.
To read all attributes, the system needs to access the same block again, as all attributes are stored within the entry itself.
Calculation:
Number of blocks to find the entry = 1 block (assuming a single block for the directory)
Number of blocks to read attributes = 1 block (since attributes are within the entry)
Total blocks accessed = 1 block (entry) + 1 block (attributes) = 2 blocks
Additional blocks due to t = 10:
However, the question states that t = 10. This implies that there are 10 attributes associated with each file, and each attribute takes up a separate block.
Therefore, to read all 10 attributes, the system needs to access an additional 10 blocks.
Final average blocks accessed:
Combining these factors, the average number of blocks accessed becomes:
2 blocks (for entry and attributes) + 10 blocks (for 10 attributes) = 12 blocks
Therefore, with t = 10 and approach 1, the average number of blocks accessed is 12.