According to the PMBOK® Guide and the PMI Guide to Business Analysis, the role of eliciting, analyzing, and documenting requirements is the primary responsibility of the Business Analyst (BA).

Requirements Traceability Matrix (RTM): This is a grid that links product requirements from their origin to the deliverables that satisfy them. The Business Analyst is specifically trained to maintain this matrix to ensure that each requirement adds business value and is accounted for at the end of the project.

Requirements Analysis: The BA acts as a bridge between the stakeholders and the technical team. They ensure that the requirements are clear, concise, and measurable. Onboarding a BA at the start of a high-visibility project ensures that the project scope remains aligned with the organization ' s strategic goals and stakeholder needs.

Relationship with the Project Manager: While the Project Manager (PM) is responsible for the project ' s overall success (schedule, budget, and resources), the BA focuses on the Product Requirements. They work in partnership to ensure that what is being built is what the business actually needs.

Analysis of other options:

Systems analyst (Option A): A systems analyst typically focuses on the technical specifications and the " how " of a system ' s design. While they use requirements, they are usually not the primary role responsible for the high-level RTM or the initial business requirements analysis.

Project sponsor (Option C): The sponsor provides the funding and high-level vision. They are an input to the requirements process, but they do not perform the technical work of requirement analysis or matrix maintenance.

Technical consultant (Option D): A consultant provides specialized expertise on a specific subject, but they do not typically own the administrative and structural process of requirements management within the project framework.

Per PMI standards, for a high-visibility project, a Business Analyst is the essential resource to ensure that the Collect Requirements process is robust and that the RTM effectively prevents scope creep by tracking every requirement to its business objective.