A Company Designed a Stateless Two-Tier Application That Uses Amazon

A company designed a stateless two-tier application that uses Amazon EC2 in a single Availability Zone and an Amazon RDS Multi-AZ DB instance. New company management wants to ensure the application is highly available. What should a solutions architect do to meet this requirement?

A) Configure the application to use Multi-AZ EC2 Auto Scaling and create an Application Load Balancer.
B) Configure the application to take snapshots of the EC2 instances and send them to a different AWS Region.
C) Configure the application to use Amazon Route 53 latency-based routing to feed requests to the application.
D) Configure Amazon Route 53 rules to handle incoming requests and create a Multi-AZ Application Load Balancer.