Which new key architectural element introduced in WebLogic Server l2c should you take  advantage of when designing Disaster Recovery Centers with active - passive mode?（）

• A、MAN Clusters, because they would allow you to synchronously replicate state in low latency networks 
• B、WAN Clusters, because they would allow you to asynchronously replicate state in nonlow latency networks.  
• C、Transaction Log in the database, because you could avoid synchronizing two replication technologies (database and file)  
• D、Data Guard, because it is the most effective way to replicate a state across locations
• E、GoldenGate, because it is the most effective way to replicate a state across locations