The correct answer is B. Once unstructured content has been chunked, vectorized, and indexed in Data
360, the prompt template should use a retriever to search that indexed content and return the most relevant passages for grounding. A data lake object or data model object is part of the data architecture, but the prompt template does not directly use those objects as the retrieval mechanism for RAG. Salesforce documentation states that retrievers are used in prompt templates to search indexed Data 360 knowledge and return relevant information. Salesforce Trailhead also explains that the prompt template invokes the retriever, vectorizes the query, retrieves matching indexed content, and inserts that retrieved information into the prompt before it is sent to the LLM.