How should you design the application?

DRAG DROP
You are designed a hybrid application that runs across a Microsoft Azure data center and your company’s on-premise enterprise environment.
You have the following requirements:
Windows Communication Foundation (WCF) services that reside within the corporate enterprise network must be securely exposed to the public cloud. A firewall connection and intrusive changes to the corporate network infrastructure are not allowed.
You need to design the application to meet the requirements.
How should you design the application? To answer, drag the appropriate item to the correct location or locations. Each item may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.
Select and Place:

Correct Answer:

Explanation/Reference:
The Service Bus relay service enables you to build hybrid applications that run in both an Azure datacenter and your own on-premises enterprise environment. The Service Bus relay facilitates this by enabling you to securely expose Windows Communication Foundation (WCF) services that reside within a corporate enterprise network to the public cloud, without having to open a firewall connection, or requiring intrusive changes to a corporate network infrastructure.

The Service Bus relay enables you to host WCF services within your existing enterprise environment. You can then delegate listening for incoming sessions and requests to these WCF services to the Service Bus service running within Azure. This enables you to expose these services to application code running in Azure, or to mobile workers or extranet partner environments.
References: https://docs.microsoft.com/en-us/azure/service-bus-relay/service-bus-dotnet-how-to-use-relay