Which Practice Area ensures alignment between requirements and plans or work products?

The correct choice focuses on the Practice Area known as Requirements Development and Management (RDM). This area is essential because it emphasizes not only the initial collection and understanding of requirements but also ongoing management throughout the project life cycle.

Requirements Development and Management involves establishing a clear relationship between what stakeholders need and how those needs translate into tangible plans and work products. This ensures that the project's objectives are aligned with stakeholder expectations and that any changes in requirements are effectively communicated and reflected in project planning and work products.

The ongoing monitoring and management of these requirements help to maintain coherence between what is being produced and what was originally intended or needed. This alignment is crucial for delivering quality outputs that meet specified needs.

In contrast, areas like Requirements Monitoring, Specifications Alignment, and Project Definition may play roles in the broader scope of project management, but they do not specifically focus on the holistic approach of capturing, managing, and aligning requirements throughout the duration of a project as effectively as Requirements Development and Management does.