D

Explanation:
The correct answer is D because quality in operations strategy is best defined as meeting the expectations of customers. This aligns with the principles of Total Quality Management (TQM), which emphasizes customer satisfaction as the core of quality. Option A focuses on capacity utilization, which is unrelated to quality definition. Option B, while relevant, is too narrow as reliability is only one aspect of quality. Option C, zero customer complaints, is an outcome of quality but not its definition, as complaints can occur even with high-quality products due to external factors.