A company has resources across multiple AWS Regions and accounts. A newly hired solutions architect finds no documentation of the resource inventory and needs to map resource relationships across all accounts and Regions. Which solution will provide this information with the MOST operational efficiency?

Workload Discovery on AWS is the most operationally efficient solution because it automatically discovers and maps resources across multiple accounts and Regions, generating architecture diagrams that show relationships. This directly addresses the need for a comprehensive resource inventory and relationship mapping without manual effort. AWS Systems Manager Inventory collects detailed instance information but doesn't automatically generate architecture diagrams showing relationships across accounts and Regions. AWS Step Functions can orchestrate data collection, but building diagrams manually is time-consuming and inefficient. AWS X-Ray traces requests through distributed applications, providing insights into application performance and service dependencies, but it's not designed for comprehensive resource inventory and architecture diagram generation across an entire AWS estate.