Planning Poker is a well-known estimation technique where team members use numbered cards (usually Fibonacci series) to estimate story point values based on relative size. It’s a consensus-based estimation method, as described in the PMI Agile Practice Guide (Section 5.2: Estimation Techniques) and Mike Griffiths’ PMI-ACP Exam Prep Book (Chapter 6: Estimating Techniques).

Option D is correct: Planning Poker is explicitly designed for estimating stories in terms of points.

Option A (Parametric) is more common in traditional (predictive) planning.

Option B (One-to-one comparison) refers to relative sizing without collaboration.

Option C (Affinity) is another agile technique but typically used for grouping stories into size buckets, not direct story point consensus estimation.