According to the BABOK® Guide, progressive elaboration is a project management approach that involves refining the requirements and project scope as more information becomes available and the level of uncertainty decreases. Progressive elaboration allows the project team to adapt to changing needs and priorities, and to deliver value incrementally. Progressive elaboration is often used in conjunction with iterative or change-driven approaches, but it is not the same as them. Therefore, option D is the correct answer. The other options are not project management approaches, but rather business analysis approaches that describe how the business analysis work is planned and performed. References: BABOK® Guide, page 24; Business Analysis Expert Certification, CCBA® | IIBA®, section “What Should I know to be CCBA Certified?”