B. Change log

The milestone of stakeholders suggesting a revision to the requirements, the BA updating the requirements, and the stakeholders signing off on the updated requirements should be tracked in the change log. The change log is a document or record that keeps track of all changes, revisions, and updates made to project requirements or documentation over the course of the project.

By maintaining a change log, the BA and the project team can keep a clear record of when changes were proposed, who proposed them, how they were addressed, and when they were approved or rejected. This helps ensure transparency and accountability throughout the project and provides a historical record of any changes that may impact project scope or deliverables.