Your Windows Communication Foundation (WCF) client application uses HTTP to
communicate with the service. You need to enable message logging and include all security
information such as tokens and nonces in logged messages. What should you do?
A.
 In the application configuration file, add the following XML segment to the 
system.serviceModel configuration section group. <diagnostics> <messageLogging 
logMessagesAtTransportLevel=”true” logEntireMessage=”true” /> </diagnostics>
B.
 In the machine configuration file, add the following XML segment to the 
system.serviceModel configuration section. <machineSettings 
enableLoggingKnownPii=”true” /> Generate the ContosoService class using the Add 
Service Reference wizard. Add the following code segment. ContosoService client = new 
ContosoService(); client.Endpoint.Behaviors.Add(new CallbackDebugBehavior(true));
C.
 In the application configuration file, add the logKnownPii attribute to the message logging 
diagnostics source and set the value of the attribute to true. Generate the ContosoService 
class using the Add Service Reference wizard. Add a reference to 
System.ServiceModel.Routing.dll. Add the following code segment. ContosoService client = 
new ContosoService(); SoapProcessingBehavior behavior = new 
SoapProcessingBehavior(); behavior.ProcessMessages = true; 
client.Endpoint.Behaviors.Add(behavior);
D.
 In the machine configuration file, add the following XML segment to the 
system.serviceModel configuration section. <machineSettings 
enableLoggingKnownPii=”true” /> In the application configuration file, add the logKnownPii 
attribute to the message logging diagnostics source and set the value of the attribute to true. 
In the application configuration file, add the following XML segment to the 
system.serviceModel configuration section group. <diagnostics> <messageLogging 
logMessagesAtTransportLevel=”true”/> </diagnostics>