You are creating a distributed application by using Microsoft .NET Framework 3.5.
You use Windows Communication Foundation (WCF) to create the application.
The operations provided by the WCF server use the remote resources of other computers.
These methods use the credentials provided by the client applications.
You need to ensure that the WCF server can impersonate the client applications to access the remote resources.
Which client application settings should you use?

A.
<windows allowedImpersonationLevel="Delegation"/>

B.
<windows allowedImpersonationLevel="Impersonation"/>

C.
<windows allowedImpersonationLevel="Identification"/>

D.
<windows allowedImpersonationLevel="Impersonation" allowNtlm="false"/>