If You Are Testing a Mobile Banking Application, Is It

If you are testing a mobile banking application, is it important to test the interaction between the software and the device?

A) No, it is not necessary to extend the functional testing to cover interaction with the device
B) Yes, using the physical device is how the user interact with the application and how the application interacts with the Internet
C) No, if the application is developed as a native application, there is no need to test the interaction because the application is portable across many different types of devices
D) Yes, each feature of the device should be tested to verify if it interacts with the application