A. White Box
B. Black Box
D. Both Black Box & Functional
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This key question is from Fourth Generation Techniques topic in portion Software Processes, Models and Agile Software Development of Software Engineering
The best explanation: Functional processing/testing is also referred to as black box testing in which contents of the black box are not known.Almost anything might be referred to as a black box:an algorithm or the human mind.Functionality of the black box is understood in terms of its inputs and outputs.