You are moving a Windows Communication Foundation (WCF) service into production. You
need to be able to monitor the health of the service. You only want to enable all
performance counter instances exposed by the ServiceModelService 4.0.0.0 counter group.
Which element should you add to the system.serviceModel section in the application
configuration file?

A.
<diagnostics performanceCounters=”ServiceOnly” />

B.
<diagnostics wmiProviderEnabled=”true” />

C.
<diagnostics wmiProviderEnabled=”true” performanceCounters=”Off” />

D.
<diagnostics performanceCounters=”All” />

Explanation: