You work as the network administrator at ESL.com. Currently, you need to test an application on a virtual machine that runs Windows Vista Service Pack1(SP1) , and you want to run multiple tests within the application. Each test will modify the settings of the application. Base on the current status, you install the application and maintain the default settings and take a snapshot. Now, you must use the default application settings to start each test. Then what should you do after completing each test?

A.
You need to reset the virtual machine

B.
You need to revert the virtual machine

C.
You need to restart the virtual machine

D.
You need to turn off and then turn on the virtual machine