You are designing an application by using Microsoft.NET Faremwork Visual Studio 2010. You plan to design an instrumentation stategy for the application. You need to ensure that the strategy meets following requirements:
Captures detaild performance information.
Enables or disables diagnostic messages by using an application configuration option without requiring the application to restart.
What should you design?

A.
a customer trace listener

B.
a custom performance counter

C.
an override to the Debug class

D.
an override to the EventLog class