The correct answer is A (Procedures). The Procedures section of an IPS outlines the steps to maintain the IPS's relevance and the protocols for addressing contingencies. It specifies the regular review process to ensure alignment with the client's evolving circumstances, objectives, and requirements.

• B (Investment Guidelines) is incorrect because this section focuses on execution policies, such as permissible leverage or excluded assets, not the review process.
• C (Statement of Duties and Responsibilities) is incorrect as it delineates the roles of the client, custodian, and investment managers, not the review procedures.