Which change most reduces the RU cost of a query that currently reports a high number of retrieved documents but returns few?
- A Add a filter on the partition key, and index the filtered properties (correct answer)
- B Switch to Eventual consistency
- C Increase page size
- D Enable TTL
Shortcut: A large gap between retrieved and output document count indicates a scan. Filtering on the partition key and ensuring filter paths are indexed converts it into a targeted index seek.