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The Prompt Builder in Salesforce has some specific limitations, one of which is that custom objects are supported only for Flex template types. This means that users must rely on Flex templates to integrate custom objects into their prompts.

Option A: While rich text area fields have certain restrictions, this does not pertain to the core limitation of integrating custom objects.

Option B: Updates and creations for prompt templates are indeed recorded in the Setup Audit Trail, so this statement is incorrect.

Option C: This is the correct answer as it reflects a documented limitation of the Prompt Builder.