单项选择题
A System z customer is planning to deploy the IBM System Storage DS6800 in each of threesmall data centers located around a large city. A backup data center with an IBM System StorageDS8100 will serve as the disaster recovery facility. Which advanced function can the customerimplement to meet disaster recovery requirements?（）
A.Global Mirror for zSeries
B.Metro Mirror
C.Global Copy
D.Metro/Global Mirror
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A.Admin/admin
B.Admin/password
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D.Admin/passw0rd (with a zero (0) for the letter "o") -
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D.Invoke a server failover/fallback and create and assign volumes to hosts -
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