Detailed Explanation:

The correct answer is A. Ask the supplier for a corrective action response.

When an audit identifies deficiencies in a supplier’s quality system, the first appropriate action is to initiate corrective action. This allows the supplier to investigate the root causes of the problems and implement corrective measures to eliminate them.

Corrective action typically includes:

Root cause analysis

Identification of contributing factors

Implementation of corrective measures

Verification of effectiveness

This approach follows the standard quality management practice of correcting problems at the source before escalating or terminating relationships.

Why the other options are incorrect:

B. Schedule a follow-up audit

A follow-up audit may be necessary later to verify that corrective actions were implemented effectively, but it is not the first step.

C. Advise purchasing to find a different source for the supplier ' s products

Switching suppliers may be necessary in severe cases, but organizations normally attempt corrective action first before replacing a supplier.

D. Notify senior management of any problems found with this supplier ' s products

Senior management may be informed depending on severity, but operationally the immediate step is to request corrective action from the supplier.

Quality Management Excellence emphasizes supplier development and corrective action processes, rather than immediate supplier replacement when issues are discovered.