Which AWS service allows a single account to pay and manage billing for multiple linked AWS accounts?

AWS Organizations enables you to consolidate multiple AWS accounts into an organization that you create and centrally manage. A key feature is consolidated billing, where one master account pays for all linked accounts, simplifying billing management and potentially reducing costs through volume discounts. AWS Trusted Advisor is a service that provides recommendations to optimize costs, improve performance, enhance security, and fault tolerance, but it doesn't manage billing across accounts. AWS Budgets allows you to set custom budgets to track your cost and usage, and receive alerts, but it doesn't consolidate billing. AWS Service Catalog allows organizations to create and manage catalogs of IT services that are approved for use on AWS, but it's not for billing consolidation.