You have an Azure subscription that contains the resources shown in the following table.

Gateway1 provides access to App1 by using a URL of https://app1.contoso.com.
You create a new web app named App2.
You need to configure Gateway1 to enable access to App2 by using a URL of https://app2.contoso.com. The solution must minimize administrative effort.
What should you configure on Gateway1?

A. a backend pool and a routing rule B. a listener and a routing rule C. a listener, a backend pool, and a routing rule D. a listener and a backend pool