Answer: Ensure ongoing compliance even after independent third-party verification.

**Explanation:** - **Option A** is incorrect because while a firm may voluntarily engage an independent third party to verify compliance for increased confidence, it is not a requirement under GIPS standards. - **Option B** is correct because firms claiming compliance with GIPS standards must self-regulate and maintain their compliance, regardless of third-party verification. - **Option C** is incorrect because portfolio inclusion criteria for composites should be determined on an ex-ante basis, not after the reporting period.

Author: LeetQuiz Editorial Team