You are the IT professional who work in an International company named Wiikigo. You are experienced in troubleshooting operating systems and applications that are not working correctly, identifying code defects and so on. You have enough knowledge on windows internals and you provide technical support for the company. There is an application for you to troubleshoot. This application runs on Windows Vista computers. The application does not close all of the files it has open. You have to find out the files that the application has open currently. So which tool should be used?

A.
Taskmgr.exe should be used.

B.
Handle.exe should be used.

C.
Perfmon.msc should be used.

D.
Tasklist.exe should be used.