You are designing an n-tier solution for use by multiple groups of users. The solution
consists of a client application that collects information from users and transmits it to a
business layer for processing. The business layer sends the information to a service layer
by using Windows Communication Foundation (WCF). The service layer exists on multiple
servers. The solution must send the collected information to a specific server in the service
layer based on the user’s group. You need to recommend an approach that will allow the
information to be sent to the correct server. What should you recommend?

A.
Create a Windows Workflow Foundation (WF) activity on the client.

B.
Implement the WCF 4 Routing Service.

C.
Impersonate the client in the business layer.

D.
Implement a duplex contract on the service layer.