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The 'defect clustering' principle states that
ADefects only occur in undocumented modules
BDefects are spread evenly across all modules
CFew modules contain most of the defects found
DDefects only occur in junior developer code
Answer & Solution
Correct answer: C. Few modules contain most of the defects found
Pareto-style observation: roughly 80% of defects come from 20% of modules. Risk-based testing leverages this by prioritising high-defect-density components for deeper coverage.
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