A financial services company sells its software-as-a-service (SaaS) platform for application compliance to large global banks. The SaaS platform runs on AWS and uses multiple AWS accounts that are managed in an organization in AWS Organizations. The SaaS platform uses many AWS resources globally. For regulatory compliance, all API calls to AWS resources must be audited, tracked for changes, and stored in a durable and secure data store. Which solution will meet these requirements with the LEAST operational overhead?