A finance director needs to analyze Azure costs across multiple departments. Which service should they use?

Azure Cost Management is the correct choice because it provides a comprehensive suite of tools for monitoring, allocating, and optimizing Azure costs. It allows users to track spending across subscriptions, resource groups, and individual resources, apply budgets, and identify cost-saving opportunities. The finance director can use its reporting and analytics features to gain insights into departmental spending. Azure Advisor offers recommendations for cost optimization but doesn't provide the detailed cost analysis and reporting capabilities needed for departmental cost allocation. Azure Policy helps enforce organizational standards and compliance, but it's not designed for cost analysis. Azure Sentinel is a security information and event management (SIEM) service, unrelated to cost management.