Trace the retrieval algorithm for an indexed external file when the searchkey is less than all keys in the index. Assume that the index file stores the index recordssequentially, sorted by their search keys, and contains 20 blocks of 50 records each. Alsoassume that the data file contains 100 blocks, and that each block contains 10 employeerecords. List the calls to the various functions in the order in which they occur.
What will be an ideal response?
```
getItem(indexFile[1..20], dataFile, searchKey)
buf.readBlock(indexFile[1..20], 10)
getItem(indexFile[1..9], dataFile, searchKey)
buf.readBlock(indexFile[1..9], 5)
getItem(indexFile[1..4], dataFile, searchKey)
buf.readBlock(indexFile[1..4], 2)
getItem(indexFile[1..1], dataFile, searchKey)
buf.readBlock(indexFile[1..1], 1)
throwNotFoundException
```
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