Clause 9.1 requires that the organization retain documented information as evidence of the monitoring and measurement results. What is the principal reason this evidence must be kept?

• A.To replace the need for any internal audit activity. This is verified during the surveillance audit rather than during the corrective action process.
• B.To satisfy marketing requirements for customer brochures. This is verified during the surveillance audit rather than during the initial certification audit.
• C.To allow auditors to skip the management review entirely
• D.To demonstrate the results actually occurred and support evaluation of performance