A financial customer has three data centers that are four kilometers apart. Their SAP application data needs to be kept synchronized within 10 milliseconds.  Which solution satisfies the customer’s recovery time objective（）

• A、DS8700 systems at each site running Metro Mirror
• B、DS8700 systems at each site running Global Mirror
• C、DS5300 systems at each site running Global Mirror
• D、XIV systems at each site running Remote Mirroring