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You are testing an application that will allow users to scan the bar code from a package mailing label and then receive emails from the package shipper as the package moves through the various stages of its delivery (e.g., pickup, receipt at central processing, routing, delivery). If requested, the user can also receive a picture of the signature of the recipient of the package.
This is the second version of this application. The first version was web browser-based and was quite slow to start up. The new version is a native application with all the same functionality. It is expected that this application will have wide usage across a large set of networks with varying speeds and reliability.
Given this information, what would be the best approach for doing your testing to ensure the capabilities of the product are tested as well as the range of devices, environments and networks?
A is correct. Because this is a native application, it needs to be tested on the devices that it is intended for. The question doesn't say how many different devices are supported, but for each supported device it makes sense to use the remote device lab that device manufacturers can supply. B is not correct because the focus needs to be on the device compatibility rather than the location distribution. C is not correct because a wide variety of devices is not needed. A good simulator for the family of devices supported might be a good alternative though. D is not correct because the testing across devices is not needed. Like C if D provides a good simulator of the right device family, it might be a realistic alternative, but that information is not supplied.