The AgentForce Data Cloud Indexing Guide clearly states that to include content from attached files such as PDFs in Knowledge articles, the correct configuration is to enable "Include Attachments" and map the ContentDocumentVersion unstructured data model object (UDMO). The documentation specifies:
"When indexing Knowledge or Case data, enabling the 'Include Attachments' option allows the Data Cloud index to extract and embed content from linked ContentDocumentVersion records, ensuring the agent retrieves relevant information from attachments." Option A (increasing chunk size) does not enable attachment ingestion. Option B (ContentDocumentLink mapping) only establishes a relationship, not content extraction. Therefore, Option C ensures attachment content becomes searchable within AgentForce retrieval.
References (AgentForce Documents / Study Guide):
* AgentForce Data Cloud Indexing and Retrieval Guide: "Including Attachments in Knowledge Indexes"
* AgentForce Implementation Handbook: "Mapping UDMO for ContentDocumentVersion"
* AgentForce Study Guide: "Attachment Content Inclusion for Knowledge Articles"