Which datafile need not be called exclusively.i.e.it performs it job,just because it is added to the application

The Initialisation file is correct: it doesn't need to be explicitly/exclusively invoked by the tester — merely being attached/added to the application is enough for it to perform its job (loading default settings/config automatically at startup). An Auxiliary File and a File Viewer, by contrast, are typically invoked deliberately when needed for a specific action (attaching supplementary data, or viewing/inspecting file contents), so 'just being added' doesn't make them function. 'None of these' is wrong because the Initialisation file fits the description given.

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