Which One of These Methods Makes the ADT Emulator a Testing

Multiple Choice

Which one of these methods makes the ADT emulator a testing device? Note that "request" is an instance of class AdRequest.

A) request.addTestDevice(AdRequest.TEST_DEVICE) ;
B) request.addDevice(AdRequest.TEST_EMULATOR) ;
C) request.addTestDevice(AdRequest.TEST_EMULATOR) ;
D) request.makeTestRequest() ;