A company is designing a highly available architecture for a stateful legacy application. The application runs on a single EC2 instance and stores session data locally on its EBS volume. The application cannot be refactored. How can the architect ensure that if the EC2 instance fails, the application is automatically recovered with its session data intact?

Use Amazon EFS instead of EBS for the session data.

Put the EC2 instance in an Auto Scaling group with a minimum and maximum size of 1. Configure a lifecycle hook to attach the existing EBS volume to the new instance upon launch.

Enable EC2 Auto Recovery. If the instance fails, Auto Recovery will migrate the instance to new hardware with the EBS volume attached.

Use AWS Backup to take continuous snapshots and restore them automatically using AWS CloudFormation.