What should you do?

A client application calls a Windows Communication Foundation (WCF) service with a proxy class that was generated by Visual Studio.
The service binding was changed from wsHttpBinding to basicHttpBinding. The method signatures in the service contract are changed.
After these changes, the client application receives errors when calling methods on the service.
You need to ensure that the client can invoke methods on the service successfully. What should you do?

A.
Update the configuration file to use basicHttpBinding.

B.
Enable anonymous authentication for the service.

C.
Copy the configuration file elements under the <system.serviceModel> element from the service back to the client.

D.
Update the service reference.