The correct answer is https://(app-name).scm.azurewebsites.net.

https://(app-name).scm.azurewebsites.net is the App Service Advanced Tools endpoint that hosts the Kudu management console. The .scm subdomain provides the Kudu console for deployments, the web-based console, and diagnostic features and you can open it directly or via the Advanced Tools blade in the Azure Portal.

https://(app-name).kudu.azurewebsites.net is incorrect because Kudu for App Service does not use a .kudu subdomain. The companion application is exposed on the .scm subdomain.

Azure Portal is not the direct Kudu URL. The portal can launch Advanced Tools which opens Kudu but the question asks for the specific URL for the companion application so the .scm address is required.

https://(app-name).azurewebsites.net is the public endpoint for the web app and it serves application traffic. It does not host the Kudu management console which lives on the .scm subdomain.

Full AWS Practitioner Certification Question