You have a secured Windows Communication Foundation (WCF) service. You need to track unsuccessful attempts to access the service. What should you do?（）

• A、Set the authorization Manager Type attribute of the service Authorization behavior to Message.
• B、Set the include Exception Detailsln Faults attribute of the service Debug behavior to true.
• C、Set the Mode attribute of the security configuration element to Message.
• D、Set the message Authentication AuditLevel attribute of the service Security Audit behavior to Failure.