Which governance tool enforces naming conventions for resource groups?

Azure Policy is the correct answer because it allows you to create, assign, and manage policies that enforce rules and effects over your resources, ensuring compliance with corporate standards and service level agreements. This includes enforcing naming conventions for resource groups and other Azure resources. Azure Cost Management helps you understand and control your Azure spending, but doesn't enforce naming. Azure Advisor provides recommendations for optimizing your Azure deployments, not policy enforcement. Azure Sentinel is a cloud-native SIEM (Security Information and Event Management) service for security analytics, unrelated to resource naming conventions.