单项选择题 A customer needs a remote data copy， data migration， and off-site backup solution. The solution cannot impact application performance. The sites are over continental distances.  Which characteristic of DS8700 Global Mirror makes it a good fit for this customer（）

单项选择题 A current IBM System Storage DS8000 open systems customer needs a temporary copy of data that will be needed for only 12 hours.  Which DS8000 function best satisfies this requirement（）

单项选择题 A customer requires an infrastructure to support disaster recovery of critical applications between two remote data centers. One data center is in Tokyo and one is in Beijing. The customer’s Recovery Point Objective （RPO） requires a six-hour window for a bandwidth of 100 MB/s and a new storage system for a total of 4 TB of data. They estimate 100 MB of new data produced hourly. What data synchronization method would be recommended to meet the requirements（）