A company is building an AI assistant with Amazon Q Business and must restrict user interactions to company-approved topics. Which feature enforces those restrictions?

Amazon Q Business application guardrails are designed to enforce restrictions on user interactions, ensuring that conversations stay within company-approved topics. This feature allows administrators to define rules and policies that prevent the AI assistant from discussing sensitive, inappropriate, or out-of-scope subjects. The Amazon Q Business Enterprise index and Starter index are types of indexes used for storing and retrieving data; they do not inherently provide content restriction capabilities. Amazon Q index cross-account access refers to the ability to share indexes across different AWS accounts, which is unrelated to content moderation.