You develop a Windows Communication Foundation (WCF) service. You enable all
performance counters and run multiple calls to the service. The service must isolate session
data for each user. You need to monitor the instancing behavior used in the service. Which
performance counter should you monitor?

A.
ServiceModelService 4.0.0.0\Calls

B.
ServiceModelService 4.0.0.0\Instances

C.
ASP.NET State Service\State Server Sessions Active

D.
ASP.NET State Service\State Server Sessions Total