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