A DevOps Engineer Is Designing a Multi-Region Disaster Recovery Strategy

Multiple Choice

A DevOps engineer is designing a multi-Region disaster recovery strategy for an application requiring an RPO of 1 hour and RTO of 4 hours. The application is deployed with an AWS CloudFormation template that creates an Application Load Balancer, Amazon EC2 instances in an Auto Scaling group, and an Amazon RDS Multi-AZ DB instance with 20 GB of allocated storage. The AMI of the application instance does not contain data and has been copied to the destination Region. Which combination of actions will satisfy the recovery objectives at the LOWEST cost? (Choose two.)

A) Launch an RDS DB instance in the failover Region and use AWS DMS to configure ongoing replication from the source database.
B) Schedule an AWS Lambda function to take a snapshot of the database every hour and copy the snapshot to the failover Region.
C) Upon failover, update the CloudFormation stack in the failover Region to update the Auto Scaling group from one running instance to the desired number of instances. When the stack update is complete, change the DNS records to point to the failover Region's Elastic Load Balancer.
D) Upon failover, launch the CloudFormation template in the failover Region with the snapshot ID as an input parameter. When the stack creation is complete, change the DNS records to point to the failover Region's Elastic Load Balancer.
E) Utilizing the build-in RDS automated backups, set up an event with Amazon CloudWatch Events that triggers an AWS Lambda function to copy the snapshot to the failover Region.