How would you describe a work breakdown structure (WBS)?

A. A narrative description of products or services that should be supplied by the project B. A technique used to decompose the project’s product C. A document that establishes agreement on objectives, product characteristics, deliverables, exclusions, constraints, assumptions, and product acceptance criteria D. A deliverable-oriented treelike representation of project work where each deliverable is decomposed into smaller, more manageable work packages