According to the PMI Professional in Business Analysis (PMI-PBA)Examination Content Outline, one of the tasks under the domain of Traceability and Monitoring is to "Track the status, priority, and disposition of requirements and issues, and communicate updates as necessary" (Task 1). This implies that the business analyst is responsible for ensuring that the requirements are delivered as stated and that any changes or issues are communicated to the relevant stakeholders. One of the techniques that can be used to perform this task is the traceability matrix, which is a table that shows the relationships between requirements and other project artifacts, such as design documents, test cases, or deliverables. A traceability matrix can help the business analyst to verify that all the requirements are covered by the test cases and that the test output matches the expected results. Therefore, the technique that the business analyst could have used to ensure that requirements were delivered as stated is the traceability matrix.