Discussion
With this type of index, the data are stored in the bottom level of the index and in the same order as that index.
Answer: B
Correct answer: Clustered
A clustered index stores the data rows themselves at its leaf level and in index order, so the index is the table. There can be only one per table for that reason, and choosing which column carries it is a significant design decision, since range queries on that column then need no further lookup.
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