The project sponsor needs to know which requirements will be implemented.

 A requirements baseline document is the most valuable document for a business analyst to provide to the project sponsor to know which requirements will be implemented. A requirements baseline document is a version of the requirements specification that has been reviewed, approved, and formally established as the basis for further development and delivery of the solution. A requirements baseline document defines the scope of the project and the expected value of the solution. It also serves as a reference point for managing changes and measuring progress. A requirements traceability matrix is a document that shows the relationship between requirements and other project artifacts, such as design, test cases, or deliverables. A requirements traceability matrix can help to ensure completeness, consistency, and quality of the requirements, but it does not indicate which requirements will be implemented. A requirements management plan is a document that describes how requirements will be elicited, analyzed, documented, validated, and managed throughout the project. A requirements management plan can help to define the roles, responsibilities, processes, and tools for managing requirements, but it does not specify which requirements will be implemented. A reliability matrix is not a standard document in business analysis, but it may refer to a tool that measures the reliability or dependability of a system or a process. A reliability matrix can help to evaluate the performance or quality of a solution, but it does not determine which requirements will be implemented. References: PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline1, page 13; Business Analysis for Practitioners: A Practice Guide2, page 76.