Which of the following best describe the customer benefit of creating a systems acceptance test plan in the design phase？（）

A. Reduce unnecessary disruption， delay，rework， and other problems by establishing test cases for use in verifying that the systems meets operational， functional， and interface requirements
B. Improve its ability to make sound financial decisions by developing a business case based on its business requirements and establishing a basis for developing a technology strategy
C. Reduce operating costs and limit charge-related incidents by providing a consistent and efficient set of processes
D. Improve the return on investment and hasten migration by identifying and planning for necessary infrastructure changes and resource additions， as well as reduce deployment costs by analyzing gaps in early in the planning process to determine whet is needed to support the system