Comprehensive and Detailed In-Depth Explanation:
ISO 9001:2015 emphasizes continual improvement as a fundamental requirement of an effective Quality Management System (QMS).
Clause Reference:
* Clause 4.4.1 (Quality Management System and Its Processes) states that organizations must:
* Determine processes needed for the QMS
* Establish criteria and methods for process effectiveness
* Ensure continual improvement of the system
Why is the Correct Answer C?
* Continual improvement is a core principle of ISO 9001.
* Organizations must regularly assess and enhance their QMS to adapt to new challenges and maintain effectiveness.
Why are the Other Options Incorrect?
* A (To change the QMS quarterly) # ISO 9001 does not mandate a specific frequency for system changes.
* B (To review the QMS annually) # QMS reviews must be conducted as needed, not strictly annually.
* D (To conduct a QMS gap analysis every two years) # Gap analysis is useful but is not a mandatory requirement under Clause 4.4.