Why is Multi-AZ deployment important for Amazon RDS?

Multi-AZ deployment is crucial for Amazon RDS because it provides high availability and failover support for database instances. In a Multi-AZ configuration, Amazon RDS automatically creates a duplicate of the database instance in a different Availability Zone. This setup ensures that if an outage occurs in the primary Availability Zone, the database can automatically fail over to the standby instance without any manual intervention.

This feature enhances the resilience of your database, allowing for minimal downtime and continuity of operations. It is particularly important for applications that require a high level of availability, as users can seamlessly access the database even in the event of a failure. Thus, Multi-AZ deployments significantly contribute to an organization's disaster recovery strategy by ensuring that data remains accessible and protected.

The other options do not encapsulate the primary benefits of a Multi-AZ deployment. For instance, reducing costs or enhancing encryption does not address availability and failover, which are the defining elements of the Multi-AZ feature.