Final answer:
Option C). The correct answer to the question is 'A WBS Dictionary' where it serves as a detailed description of the deliverables in a WBS, providing essential information for executing each element.
Step-by-step explanation:
A WBS Dictionary is a document that provides a more thorough description of the deliverables on the Work Breakdown Structure (WBS). By giving thorough deliverable descriptions, outlining the project's scope, and supporting team members with their assigned responsibilities, this document enhances the WBS. In contrast to an appendix, which comprises extra materials that can be deleted, the WBS Dictionary is a necessary part of comprehending each WBS element and making sure that all team members are aware of the same information. It frequently contains information about the work package owner, the estimated time of completion, the cost, the resources needed, and the completion criteria.