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A company has a web application that runs on an Auto Scaling group of Amazon EC2 instances distributed across multiple Availability Zones, with traffic managed by an Application Load Balancer. Amazon RDS MySQL is used for the database tier, and incoming traffic is routed to the load balancer through Amazon Route 53. The Application Load Balancer has a health check that monitors the status of the web servers and verifies that the servers can properly access the database. For compliance purposes, management instructed the Operations team to implement a geographically isolated disaster recovery site to ensure business continuity. The required RPO is 5 minutes, while the RTO should be 2 hours. Which of the following options requires the LEAST amount of changes to the application stack?