A global enterprise wants centralized management of user access and authentication across Azure services. Which feature should they implement?

Azure Active Directory (Azure AD) is the correct choice because it provides identity and access management (IAM) services, enabling centralized control over user access and authentication for Azure resources and cloud applications. It acts as a universal platform for managing identities. Azure Monitor is incorrect because it focuses on collecting, analyzing, and acting on telemetry data from your Azure and on-premises environments, not identity management. Azure Key Vault is incorrect as its primary function is to securely store and manage cryptographic keys, secrets, and certificates. Azure Policy is incorrect because it helps enforce organizational standards and assess compliance at scale, rather than managing user identities and authentication directly.