Which of the following is NOT a Testing Model?
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V model
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Agile model
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X model
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Waterfall model
C
Correct answer
Explanation
V model, Agile model, and Waterfall model are well-known software development/testing models. The 'X model' is not a recognized testing or development model in standard software engineering literature. This appears to be a fabricated option to test fundamental knowledge of testing models.