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According to the AgentForce and Einstein Studio Integration Guide, when a business requires custom ranking or filtering logic (such as by product line and recency), the correct solution is to build a custom retriever in Einstein Studio. The documentation describes: “Custom retrievers in Einstein Studio enable configuration of metadata filters (e.g., product line) and custom ranking functions such as recency or relevance scoring. This allows fine-tuned control over retrieval beyond the default retriever’s capabilities.”

Option A, the default retriever, provides general ranking and does not natively apply custom filters. Option C, applying semantic embeddings with default filters, is useful for general search optimization but lacks custom ranking logic.

Therefore, Option B aligns with Salesforce’s prescribed method for fine-tuned retrieval control in enterprise use cases requiring metadata-based and recency ranking.

References (AgentForce Documents / Study Guide):

AgentForce Einstein Studio Guide: “Building Custom Retrievers with Metadata and Ranking”

AgentForce Data Cloud Configuration Notes: “Filtering and Ranking in Custom Retrieval”

AgentForce Study Guide: “Advanced Retrieval Customization in Einstein Studio”