Why A is correct
Effectiveness review verifies that corrective actions actually addressed the root cause and the nonconformity has not recurred.
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Iso Continual Improvement
Continual improvement of the ISMS: corrective action, nonconformity handling, and the Plan-Do-Check-Act cycle.
This question belongs to the "Performance Evaluation & Improvement" domain, which makes up about 15% of the ISO 27001 exam.
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