A customer wants to purchase an IBM System Storage DS8700 to support a high-performance database environment. 
Which technical solution gives the customer the best relationship between I/O performance at the machine’s backend vs. capacity installed in the machine（）

A.additional installation of the first and second expansion frame will increase the backend performance capability
B.the usage of 300 GB/15k FC disks will give the server a high-performance backend capability
C.performance Accelerator restricts the number of disks connected to one device adapter pair to 32 disks
D.the second RIO-G loop between the base frame and the first expansion increases the backend performance