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A multi-national company operates hundreds of AWS accounts and the CTO wants to rationalize the operational costs. The CTO has mandated a centralized process for purchasing new Reserved Instances (RIs) or modifying existing RIs. Whereas earlier the business units (BUs) would directly purchase or modify RIs in their own AWS accounts independently, now all BUs must be denied independent purchase and the BUs must submit requests to a dedicated central team for purchasing RIs. As an AWS Certified Solutions Architect Professional, which of the following solutions would you combine to enforce the new process most efficiently? (Select two)