单选题
AMAN Clusters, because they would allow you to synchronously replicate state in low latency networks
BWAN Clusters, because they would allow you to asynchronously replicate state in nonlow latency networks.
CTransaction Log in the database, because you could avoid synchronizing two replication technologies (database and file)
DData Guard, because it is the most effective way to replicate a state across locations
EGoldenGate, because it is the most effective way to replicate a state across locations
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