A customer RFP requires installation of an open system SAN and migration of 40 TB currently residing on ten UNIX servers （on internal server disk）. The Service Level Agreement （SLA） requires no more than five minutes per week of planned downtime for backup.  Which IBM System Storage solution is the most cost effective（）

• A、an IBM System Storage DS8700 with LTO tape drive
• B、an IBM System Storage DS8700 with FlashCopy Manager
• C、an IBM XIV Storage System
• D、an IBM XIV Storage System with SAN Volume Controller