Which Azure feature should a security manager use to ensure only specific roles can deploy virtual machines?

Azure Policy is the correct choice because it allows you to define and enforce organizational standards and compliance at scale. You can create a policy definition that specifies which roles are permitted to deploy virtual machines, ensuring that only authorized users can perform this action. Azure Monitor is used for collecting, analyzing, and acting on telemetry data from your Azure and on-premises environments, not for enforcing deployment permissions. Azure Resource Graph provides an efficient and performant way to query across all your Azure resources, which is useful for inventory and discovery but doesn't control deployments. Azure App Service is a fully managed platform for building, deploying, and scaling web apps and APIs, and is unrelated to enforcing deployment policies for virtual machines.