Context Analysis:

Developers want to close defects unilaterally, while testers are concerned about unresolved or misunderstood issues being overlooked.

Defect closure requires validation that the fix is implemented and verified to prevent recurrence of the issue.

Evaluation of Options:

A. Only testers should be allowed to close defect reports:

Incorrect. This creates a bottleneck and removes shared accountability for quality.

B. Only management should be allowed to close defect reports:

Incorrect. Management involvement adds unnecessary delays and complexity.

C. No one should close a defect report until the release is completed and the product is successfully deployed to production:

Incorrect. Defects should be closed as they are fixed and tested to ensure progress is tracked.

D. Closure should only occur when a defect is fixed and tested:

Correct. Ensures collaboration between developers and testers to verify the resolution.

Syllabus Alignment:

The ISTQB syllabus emphasizes clear defect management processes, including closure after verification (TM-2.3.4).