A bank has requested proposals for a storage solution to upgrade their disaster recoveryprocesses for their System z, UNIX, and Microsoft Windows environment. The solution mustsimulate a multi-site environment and provide the customer the ability to explore Metro Mirror,Global Mirror, Global Mirror for z/OS, and FlashCopy. Floor space is limited. Which solution bestmeets the specified requirements?（）

• A、Two IBM System Storage DS8100 systems
• B、One IBM System Storage DS8300 with two LPARs
• C、Two IBM System Storage DS6800 systems in a single rack
• D、One IBM System Storage DS6800 for System z, and SVC for UNIX and Windows