A Company Runs an Application on Amazon EC2 Instances Behind

A company runs an application on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group across multiple Availability Zones in us-east1. The application stores data in an Amazon RDS MySQL Multi-AZ DB instance. A DevOps Engineer wants to modify the current solution and create a hot standby of the environment in another region to minimize downtime if a problem occurs in us-east-1. Which combination of steps should the DevOps Engineer take to meet these requirements? (Choose three.)

A) Add a health check to the Amazon Route 53 alias record to evaluate the health of the primary region. Use AWS Lambda, configured with an Amazon CloudWatch Events trigger, to elect the Amazon RDS master in the disaster recovery region.
B) Create a new Application Load Balancer and Auto Scaling group in the disaster recovery region.
C) Extend the current Auto Scaling group to the subnets in the disaster recovery region.
D) Enable multi-region failover for the RDS configuration for the database instance.
E) Deploy a read replica of the RDS instance in the disaster recovery region.
F) Create an AWS Lambda function to evaluate the health of the primary region. If it fails, modify the Amazon Route 53 record to point at the disaster recovery region and elect the RDS master.