An engineer needs recommendations to identify unused virtual machines to cut unnecessary costs. Which tool provides those recommendations?

Azure Advisor is the correct tool because it provides personalized recommendations to optimize Azure deployments, including identifying underutilized or idle resources like virtual machines, which helps reduce costs. It analyzes your resource configuration and usage telemetry. Azure Policy is incorrect because it's used to enforce organizational standards and assess compliance, not to provide cost-saving recommendations for unused resources. Azure Resource Locks are incorrect because they prevent accidental deletion or modification of resources, they don't identify unused resources. Azure Sentinel is incorrect because it's a cloud-native Security Information and Event Management (SIEM) and Security Orchestration, Automation, and Response (SOAR) solution, focused on security, not cost optimization recommendations.