You are developing a RAG solution and have decided to use a classifier branch as...

The decisive point is failure isolation: Option C keeps the agent’s decision path observable instead of burying behavior inside one prompt or one service. Classifier branches are more semantic than prompt filters and can generalize beyond exact keywords. They still require validation and monitoring, but they catch patterns prompt text may miss. The runtime should therefore be built around policy enforcement placed around user inputs, retrieved context, tool execution, and generated responses. The selected option specifically C states “Classifier branches can automatically adapt to new forms of harmful language.”, which matches the operational requirement rather than a superficial wording match. The alternatives would look simpler in a prototype, but ignoring protected attributes in prompts does not reliably prevent proxy bias or demographic inference in outputs. The stack-level anchor is clear: NVIDIA Guardrails can be integrated without throwing away existing LangChain-style workflows, preserving architecture while adding enforcement. The answer is therefore about engineered control planes, not simply model capability.