Which combination of steps should a solutions architect take to provide high availability for this architecture?

A company has a two-tier application architecture that runs in public and private subnets. Amazon EC2 instances running the web application are in the public subnet and a database runs on the private subnet. The web application instances and the database are running in a single Availability Zone (AZ).

Which combination of steps should a solutions architect take to provide high availability for this architecture? (Choose two.)
A . Create new public and private subnets in the same AZ for high availability.
B . Create an Amazon EC2 Auto Scaling group and Application Load Balancer spanning multiple AZs.
C . Add the existing web application instances to an Auto Scaling group behind an Application Load Balancer.
D . Create new public and private subnets in a new A
E . Create a database using Amazon EC2 in one A
G . Create new public and private subnets in the same VPC, each in a new A
H . Migrate the database to an Amazon RDS multi-AZ deployment.

Answer: BE