Comprehensive and Detailed In-Depth Explanation:

ISO 9001:2015 recognizes change management as essential for maintaining process integrity and preventing nonconformities.

Clause References:

Clause 6.3 (Planning of Changes) → Focuses on long-term changes that may impact QMS integrity.

Clause 8.5.6 (Control of Changes) → Focuses on changes occurring during production and service provision to ensure conformity.

Why is the Correct Answer A?

Clause 8.5.6 applies specifically to operational changes, ensuring that modifications in production or service processes do not compromise quality.

Organizations must document who approves changes, how they are controlled, and how they affect product/service conformity.

Why are the Other Options Incorrect?

B (Changes during design and development) → Covered under Clause 8.3 (Design and Development), not 8.5.6.

C (Changes to legal and regulatory requirements) → Addressed under Clause 4.2 (Interested Parties ' Requirements).

D (Leadership responsibilities) → Covered under Clause 5.1 (Leadership and Commitment), not 8.5.6.