ISO 9001, the international standard for quality management systems, is structured into specific, auditable clauses. The relationship with purchasers and suppliers is addressed in Clause 8 (Operation). Internal Quality System Audits are a mandatory requirement detailed in Clause 9.2 (Internal audit). Documentation requirements are specified in Clause 7.5 (Documented information).

In contrast, the seven "Management principles" (e.g., customer focus, leadership, process approach) are the foundational concepts described in the companion standard ISO 9000:2015. While the requirements in ISO 9001 are based on these principles, the principles themselves are not a distinct, auditable clause or section within the ISO 9001 standard.

A. Purchaser and Supplier: Incorrect. ISO 9001:2015 Clause 8.4 explicitly covers the control of external providers (suppliers), and customer (purchaser) focus is a core theme of the standard.

B. Internal Quality System Audits: Incorrect. This is a mandatory requirement detailed in ISO 9001:2015, Clause 9.2, which is a key part of the performance evaluation and improvement cycle.

D. Documentation: Incorrect. ISO 9001:2015 has a dedicated section, Clause 7.5 "Documented information," which outlines the requirements for creating, updating, and controlling necessary documentation.

1. International Organization for Standardization. (2015). ISO 9001:2015(en) Quality management systems — Requirements. See Clauses 7.5 ("Documented information"), 8.4 ("Control of externally provided processes, products and services"), and 9.2 ("Internal audit").

2. International Organization for Standardization. (2015). ISO 9000:2015(en) Quality management systems — Fundamentals and vocabulary. See Section 2.3 ("Quality management principles"), which details the seven principles as the foundation for the standard.

3. de Bruyn, R. (2016). The new ISO 9001:2015. University of Pretoria, Gordon Institute of Business Science. This academic overview distinguishes between the foundational principles (from ISO 9000) and the auditable clauses within the ISO 9001 standard. (Available through university research portals).