Who is responsible for maintaining the Business Case throughout the project?
The SRO owns the Business Case and is accountable for it throughout the project.
Why this answer
The Senior Responsible Owner (SRO/Executive) is the single person ultimately accountable for the project's business justification. They own the Business Case and are responsible for ensuring it remains viable, aligned with corporate strategy, and is formally reviewed at key decision points (e.g., stage boundaries). The PRINCE2 principle of continued business justification places this accountability squarely on the Executive, not on the Project Manager or support roles.
Exam trap
PeopleCert often tests the distinction between accountability (Executive) and responsibility (Project Manager) for the Business Case, trapping candidates who confuse day-to-day maintenance with ultimate ownership.
How to eliminate wrong answers
Option A is wrong because the Senior Supplier represents the interests of those providing the project's specialist products and resources; they do not own the Business Case, though they contribute to its feasibility. Option C is wrong because Project Support provides administrative and advisory services (e.g., maintaining registers, configuration management) but has no authority to own or approve the Business Case. Option D is wrong because the Project Manager is responsible for developing, reviewing, and maintaining the Business Case on a day-to-day basis, but the ultimate accountability and ownership rests with the Executive (SRO).