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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

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出自：Oracle认证

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