Which is not a testing principle
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Early testing
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Defect clustering
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Pesticide paradox
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Exhaustive testing
D
Correct answer
Explanation
Exhaustive testing (testing all possible inputs and combinations) is impractical and impossible for non-trivial systems - it's NOT a testing principle. Early testing, defect clustering (Pareto principle), and pesticide paradox (repeated tests become less effective) ARE recognized testing principles.