Transfer of Development Rights (TDR) programs aim to protect specific areas (e.g., farmland, historic sites) from development by allowing landowners to sell development rights to other areas where growth is desired. Option B (protecting an area from development) accurately reflects this goal. The APA’sAICP Certification Exam Content Outline(2022), under “Plan and Policy Development,” defines TDR as “a tool to protect areas from development by transferring development rights to designated receiving areas.” Option A (extinguishing development potential) is incorrect, as TDR preserves potential by relocating it. Option C (vesting rights) is unrelated to TDR’s purpose. Option D (slowing development) is a secondary effect, not the primary aim. TheCPC Study Manual(2024) states, “TDR programs are designed to protect areas from development by redirecting growth,” supporting option B.