A solutions architect is performing a security review of a recently migrated workload. The workload is a web application that consists of Amazon EC2 instances i...

A solutions architect is performing a security review of a recently migrated workload. The workload is a web application that consists of Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer. The solutions architect must improve the security posture and minimize the impact of a DDoS attack on resources.
Which solution is MOST effective?