A customer is performing a cost justification of advanced software functions for several disksubsystem vendors. Which of the following software features of the Storwize V7000 arechargeable?（）
- A、Easy Tier, FlashCopy
- B、FlashCopy, External Virtualization
- C、Metro/Global Mirror, Thin Provisioning
- D、External Virtualization, Metro/Global Mirror
正确答案:D
答案解析:有
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