Which of the following key project elements is used to organize deliverables into manageable pieces to ensure the proper steps are executed and to achieve the project's core objectives?

A Work Breakdown Structure (WBS) is a hierarchical decomposition of the total scope of work to be carried out by the project team to accomplish the project objectives and create the required deliverables. It breaks down the project into manageable sections, making it easier to plan, estimate, and control the project work.

RACI is a responsibility assignment matrix (Responsible, Accountable, Consulted, Informed) used to clarify roles and responsibilities, not to organize deliverables into manageable pieces.

An RFP (Request for Proposal) is a document used in procurement to solicit bids from potential vendors, not an element for organizing project deliverables internally.

PERT (Program Evaluation and Review Technique) is a project management tool used for scheduling, organizing, and coordinating tasks within a project, often visualized as a network diagram, but it is not the primary element for breaking down deliverables themselves.