Implementing user authentication and authorization

1. An ASP.NET Core application that you’ve successfully deployed to an App Service needs to authenticate users with their Azure Active Directory (AAD) accounts. When you enable authentication for your application within the Azure portal, which one of the following types of resources is required to integrate your app with AAD?
   1. An application gateway
   2. An application proxy
   3. An app registration
2. You’re developing an internal .NET Core application that will run on users’ devices and require them to authenticate with their AAD accounts. You are using the Microsoft.Identity.Client NuGet package in your project:

   var app = [missing word]
       .Create(_clientId)
       .WithAuthority(AzureCloudInstance.AzurePublic, _tenantId)
       .WithRedirectUri("http://localhost")
       .Build();

Which one of the following is the missing word from...