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
A
Ref URL : http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.html
A