Public sector planners primarily focus on developing and analyzing policies to guide community development, making policy research and analysis (option D) a core function. This involves studying data, trends, and regulations to inform plans and decisions. The APA’s AICP Certification Exam Content Outline (2022), under “Administration and Management,” lists “policy research and analysis as a primary function of public sector planners, ensuring evidence-based decision-making.” Option A (CIP budgets) is typically handled by finance or engineering departments, with planners providing input. Option B (park master plans) is a specific task, not a primary function. Option C (subdivision and zoning code administration) is a responsibility, but it’s more operational than strategic. The CPC Study Manual (2024) states, “Public sector planners focus on policy research and analysis to shape community development strategies,” supporting option D.