A company plans to deploy its web application across multiple AWS Availability Zones. Which consideration helps ensure high availability in this architecture?
Design the application to automatically route traffic away from an Availability Zone that becomes unhealthy, without requiring manual intervention.
Distributing components across different Availability Zones removes the need for data replication between them.
Place all mission-critical resources in a single Availability Zone so they stay physically close and more resilient.
Rely on Availability Zones to provide automatic state replication so stateful components fail over with no additional configuration.
Running the workload in more than one Availability Zone protects the application from a single-zone failure. The application (or supporting services such as Elastic Load Balancing and Amazon EC2 Auto Scaling) should automatically detect an unresponsive zone and direct traffic to healthy resources in the remaining zones. Relying on one zone introduces a single point of failure, Availability Zones do not automatically replicate the state of applications, and distributing components across zones does not remove the need to replicate data between them.
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