Which one of these methods makes the ADT emulator a testing device?

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();