After putting together a configuration that meets customer’s requirements， a TDA is suggested. The customer is not familiar with the TDA process and asks why this should be done. This of the following is the benefit of TDA？（）

A.A TDA are recommended only for high end hardware and very large or complex business opportunities

B.A TDA will ensure the solution and configuration are complete and technically sound and meet customer requirements

C.A TDA will guarantee that the hardware will work in customer’s environment at the volumes projected

D.A TDA brings an IBM technician onsite to properly inspect and installed hardware and related software