You need to recognize the cause of the error

You work as a Windows Developer for PassGuide.com. You need to generate a Windows
Communication Foundation service by using Microsoft .NET Framework 4.0. You set up tracing for
the service. The tracing fails because of an error in the service configuration. You need to
recognize the cause of the error. What should you do to accomplish the service without any error?

A.
Observe the application log.

B.
Observe the system event log.