You are developing a Windows application by using Microsoft .NET Framework 4. You plan
to design a diagnostic logging strategy that will be used in a production environment. You
need to ensure that the strategy meets the following requirements: • Enables or disables

diagnostic messages by using an application configuration option. • Changes the level of
detail in the diagnostic messages without recompiling the application. Which class should
you use?

A.
Debug

B.
Contract

C.
Trace

D.
EventLog