An IBM Business Partner has sold a DS5020 and new IBM SAN switches to replace a customer EMC storage infrastructure. The customer dissatisfaction has arisen during the installation because according to the DS5020 interoperability matrix， two HP Proliant servers running Exchange have FC HBAs that are not supported. Which of the following is the most probable cause of the customer dissatisfaction（）

A. The EMC storage specialist has not participated in the TDA meeting
B. The FC HBAs are 4 Gbps technology
C. The Technical and Delivery Assessment review actions were not executed
D. The customer should have checked that the HBAs are supported according to the HP storage interoperability matrix