A customer with an IBM Power System running AIX is using an IBM System Storage DS8100 inLocation A, and an IBM System Storage DS5100 in Location B. The distance between Location Aand Location B is 25 kilometers. The customer wants a redundant copy of the data inLocation Bfor disaster recovery. Which of the following solutions will best satisfy this requirement?（）

• A、install FlashCopy on the DS8100 
• B、install SAN Volume Controllers with FlashCopy
• C、install SAN Volume Controllers with Metro Mirror 
• D、install Global Mirror on the DS8100 and Enhanced Remote Mirror on the DS5100