Which tool lets a developer query and analyze metadata for Azure resources across multiple subscriptions?

Azure Resource Graph is the correct answer because it provides an efficient and performant way to explore Azure resources at scale, allowing developers to query and analyze metadata across multiple subscriptions. It's designed for resource exploration and management. Azure Advisor provides recommendations for optimizing Azure resources for cost, performance, reliability, operational excellence, and security, not for querying metadata. Azure Monitor collects, analyzes, and acts on telemetry from your Azure and on-premises environments, focusing on performance and availability, not resource metadata queries. Azure Sentinel is a cloud-native Security Information and Event Management (SIEM) solution for security analytics, not resource metadata querying.