Which Azure construct ensures a production app is deployed identically across dev, test, and production environments?

Azure Resource Manager (ARM) is the correct answer because it provides a management layer that enables you to create, update, and delete resources in your Azure subscription. It uses declarative templates (ARM templates) to define the infrastructure and configuration of your resources. This ensures consistent deployments across different environments (dev, test, production) because the same template can be used to deploy identical resource configurations. Azure Advisor provides recommendations for optimizing resources, not for consistent deployments. Azure Monitor collects and analyzes telemetry data, focusing on performance and availability. Azure Arc extends Azure management to on-premises, multi-cloud, and edge environments, but doesn't inherently guarantee identical deployments across Azure environments.