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A sort key must be built on any relation to be able to sort it. Then the sorted relation can be read using the index

1. A sort key must be built on any relation to be able to sort it. Then the sorted relation can be read using the index.

1. Sort
2. Primary
3. Index
4. Composite

Answer: A) Sort

Explanation:

A sort key must be built on any relation to be able to sort it. Then the sorted relation can be read using the index.