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