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An index is clustered, if

1. it is on a set of fields that form a candidate key.
2. it is on a set of fields that include the primary key.
3. the data records of the file are organized in the same order as the data entries of the index.
4. the data records of the file are organized not in the same order as the data entries of the index.

Correct answer: the data records of the file are organized in the same order as the data entries of the index.

Solution

A clustered index organizes the actual data records in the database according to the order of the index entries, allowing for efficient data retrieval based on the indexed fields.

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