Which Amazon RDS capability automatically creates a primary DB instance and synchronously replicates its data to a standby instance in a different Availability Zone?
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Correct answer: Multi-AZ deployment.
Why this is the answer
Multi-AZ deployment for Amazon RDS automatically provisions and maintains a synchronous standby replica of your DB instance in a different Availability Zone. This provides high availability and automatic failover in case of an outage in the primary Availability Zone. Read replicas are asynchronous copies used for scaling read traffic, not for high availability or automatic failover. Blue/green deployment is a strategy for updating databases with minimal downtime, not for automatic failover. Reserved Instances are a billing option that provides a discount compared to on-demand pricing, not a high availability feature.
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