You have been doing your mobile application performance testing on a simulator. Why would you need to do some testing on a real device?
A is correct. A simulator is not a real device and doesn't have the hardware and connectivity characteristics that the real device has. B is not correct because you can thoroughly test a simulator, but that still won't get around the problem in A. C is not correct because this is precisely why simulators are used -- they are easily cloned. D is not correct because simulators can certainly run concurrent applications
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