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How does Amazon RDS multi Availability Zone model work?

A.
A second, standby database is deployed and maintained in a different availability zone from master, using synchronous replication.

B.
A second, standby database is deployed and maintained in a different availability zone from master using asynchronous replication.

C.
A second, standby database is deployed and maintained in a different region from master using asynchronous replication.

D.
A second, standby database is deployed and maintained in a different region from master using synchronous replication.

Explanation:
In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a
different Availability Zone.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html

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