You must design a configuration management solution for five apps running in development, test, and production that supports feature flags, retains 30 days of change history, stores hierarchical configuration values, enforces RBAC, and provides shared key/value pairs. Which Azure service meets these requirements?

Azure App Configuration is the correct choice because it directly addresses all specified requirements. It's designed for centralized management of application settings and feature flags, offering built-in support for hierarchical configuration values and robust RBAC for access control. It also maintains a history of changes, allowing for rollbacks and auditing, which satisfies the 30-day change history requirement. Azure Cosmos DB is a NoSQL database, not primarily a configuration management service. Azure App Service is a platform for hosting web applications, not for managing their configurations. Azure Key Vault is for securely storing secrets like connection strings and certificates, not for general application configuration or feature flags.