Which Azure tool should a CIO use to display cost, performance, and compliance metrics on a single dashboard?

Azure Dashboard is the correct choice because it allows users to create customized views of their Azure resources. A CIO can pin various metrics, including cost, performance, and compliance data from different Azure services, to a single, consolidated dashboard for easy monitoring and reporting. Azure Service Health provides information about the health of Azure services and regions, not a customizable dashboard for resource metrics. Azure Portal Home is a default landing page that offers quick access to recently used resources and services, but it's not designed for comprehensive, customizable metric display. Azure Marketplace is a catalog of applications and services offered by Microsoft and third-party vendors, not a monitoring tool.