This question aligns with Measurement and Analysis , focusing on commonly used data sources to evaluate patient experience and service performance. Option D is correct because patient complaints and patient satisfaction data are the most widely utilized and standardized sources across healthcare organizations. These data sources provide both quantitative metrics (e.g., survey scores) and qualitative insights (e.g., complaint narratives) , offering a comprehensive view of performance. CPXP principles emphasize that complaints highlight gaps and opportunities for improvement, while satisfaction data allows benchmarking and trend analysis over time. Although compliments (A), service recovery logs (B), and phone feedback (C) are useful, they are typically supplemental. Complaints and satisfaction data remain the primary, consistent, and actionable sources for evaluating and improving patient experience.