A.rank， array， extent pool， volumes， volume group， host connections
B.rank， array， extent pool， volume group， volumes， host connections
C.array， rank， extent pool， volume group， volumes， host connections
D.array， extent pool， volumes， rank， volume group， host connections

A.the bandwidth of the PPRC connection between the two sites is too small
B.the DS8000 SFI at the remote site was shipped with slower disks
C.I/O rates vary， depending on the distance between the two sites and the rates cannot be changed easily， due to latency
D.the DB2 database does not work with Metro Mirror without an additional license