According to the BABOK® Guide, a plan-driven approach to business analysis and change management is an approach that involves defining the requirements and the solution scope upfront, and managing changes to them through a formal process. In this approach, changes to requirements are usually approved by a change control board (CCB), which is a group of stakeholders who are authorized to review, evaluate, and approve or reject change requests. The CCB ensures that the changes are aligned with the project objectives, scope, and benefits, and that they are communicated to the relevant stakeholders. Therefore, option A is the correct answer. The other options are not the most likely to approve changes to requirements in a plan-driven approach, as they may not have the authority, the perspective, or the responsibility to do so. References: BABOK® Guide, page 24; Business Analysis Expert Certification, CCBA® | IIBA®, section "What Should I know to be CCBA Certified?"