A customer has two Power 770 systems with 4 enclosures each.  Thirty two cores and 1TB of memory are activated on each system.  Each system has 3 database partitions and each partition has 10 cores and 300GB of memory.   Which solution will provide automated recovery of unplanned outages at least cost？（）

A、Purchase PowerVM Enterprise Edition.Use System Director to automate Live Partition Mobility to recover from partition failure

B、Create additional shared processor partitions as standby nodes.Use PowerHA SystemMirror to activate and use CoD resources when a failover occurs

C、Purchase an additional 32-core Power 750 with PowerHA SystemMirror Standard Edition.Use the new system as standby node with the XD component of PowerHA

D、Purchase an additional Power 770 system.Locate production and standby database partitions on each system.Use DB2 pureScale to provide automated partition monitoring and failover