What does a hybrid query in RediSearch allow?

1. ✓ A Combining a filter expression with a KNN vector search in one command (correct answer)
2. B Querying two indexes at once
3. C Joining two Redis databases
4. D Mixing RDB and AOF

Shortcut: A pre-filter such as '(@category:{docs})=>[KNN 5 @vec $B]' restricts candidates by tag or numeric criteria before the vector search, improving both relevance and speed.