Which feature delivers real-time cost insights and budget alerts across Azure subscriptions?

Azure Cost Management + Billing is the correct answer because it provides tools to monitor, analyze, and optimize your Azure costs. It offers real-time cost insights, allows you to create budgets, set up alerts for spending thresholds, and export cost data for detailed analysis across all your Azure subscriptions. Azure Monitor focuses on collecting, analyzing, and acting on telemetry from your Azure and on-premises environments, not primarily on cost management. Azure Advisor provides personalized recommendations for best practices across various categories like cost, security, reliability, and performance, but it doesn't offer the comprehensive cost tracking and budgeting features of Cost Management + Billing. Azure Blueprints helps you define repeatable sets of Azure resources that adhere to organizational standards and compliance, which is unrelated to cost monitoring.