You’re building a RAG system that uses RAG Fusion.

For this scenario, Option B is defensible because it exposes the control plane that a senior engineer can test, scale, and harden. The selected option specifically B states “Using the LLM to automatically identify the most important sentences within each chunk and combine them.”, which matches the operational requirement rather than a superficial wording match. Letting the LLM identify salient sentences across chunks is a better fusion strategy than raw concatenation. The model must synthesize, not just paste. The high-value engineering move is semantic retrieval backed by vector stores plus evaluation of chunk relevance, recall, freshness, and latency. Within the NVIDIA stack, NVIDIA’s agent patterns favor composable retrieval tools that can be called, traced, and optimized independently from the model endpoint. The losing choices mostly optimize for short-term convenience; using client data without quality checks shifts bad data directly into model behavior. Anything less would make the agent fragile when traffic, schemas, policies, or user behavior shift.