An IBM System x Technical Expert has a prospective customer who is very excited about X5 and they are working on configurations. During the process the customer has changed the design numerous times and has significantly increased the scope. They recently selected a Business Partner who has been involved in the last few design changes. What steps should be taken to make sure the customer is satisfied with the solution?（）

A. Turn over current design to Techline to create configurations
B. Perform knowledge transfer of design requirements to Business Partner then disengage
C. Work with business partner to engage Techline to assist with configurations and request Technical and Delivery Assessment (TDA)
D. Work with business partner to engage Techline to create configuratio