You are developing an e-Commerce Web App. You want to use Azure Key Vault to ensure that sign-ins to the e-Commerce Web App are secured by using Azure App Service authentication and Azure Active Directory (AAD). What should you do on the e-Commerce Web App? 

Answer options:

A. Run the az keyvault secret command.
B. Enable Azure AD Connect.
C. Enable Managed Service Identity (MSI).
D. Create an Azure AD service principal.

C

A managed identity from Azure Active Directory allows your app to easily access other AAD-protected resources such as Azure Key Vault. Reference: https://docs.microsoft.com/en-us/azure/app-service/overview-managed-identity https://docs.microsoft.com/en-us/samples/azure-samples/app-service-msi-keyvault-dotnet/keyvault-msi-appservice-sample/