Comprehensive and Detailed In-Depth Explanation:

ISO 9001:2015 emphasizes the importance of communication as part of an effective Quality Management System (QMS).

Clause References:

Clause 7.4 (Communication): This requires organizations to establish what, when, with whom, and how communication should take place to ensure effectiveness.

Quality Management Principle – Engagement of People: Effective communication allows stakeholders (employees, suppliers, customers) to fully participate and contribute to quality objectives.

Why is the Correct Answer A?

Appropriate communication means ensuring that messages are clear, relevant, and accessible to the intended audience.

Different stakeholders (employees, customers, regulatory bodies, suppliers) may require different formats, languages, or media to ensure they fully understand and engage.

This aligns with ISO 9001:2015, which emphasizes that communication must be tailored to the needs of the recipient for maximum effectiveness.

Why are the Other Options Incorrect?

B (Timely responses) → Important but does not specifically refer to appropriateness in communication.

C (Communicating processes and assumptions to all interested parties) → Communication should be relevant; sharing all details might not be necessary or appropriate.

D (Only top management handling external communication) → Communication must be distributed across relevant functions, not restricted to leadership.