The task performed to ensure that all requirements align with the business need is 'Validate Requirements'. This process involves confirming that stakeholder, solution, and transition requirements are in line with the business requirements. It ensures that the designs satisfy the requirements and that both requirements and designs deliver business value and support the organization's goals and objectives. Validation is an ongoing activity that plays a crucial role in the business analysis process, as it helps to ensure that the project delivers the intended value and meets the needs it was designed to address.