How would you answer an interview scenario involving Reranking?

For an interview scenario involving Reranking, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Reranking uses a stronger relevance model or scoring stage to reorder initially retrieved candidates. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.