A DevOps engineer is tasked with managing a web application hosted on Amazon EC2 instances behind an Application Load Balancer (ALB), which are part of an EC2 Auto Scaling group spanning multiple Availability Zones. The engineer must implement a deployment strategy that ensures the following: 1) A second fleet of instances is launched with identical capacity to the existing fleet. 2) The original fleet remains operational without modification during the launch of the second fleet. 3) Traffic is seamlessly switched to the second fleet once it is fully operational. 4) The original fleet is automatically terminated one hour after traffic has been redirected. Which AWS service or combination of services should the engineer use to achieve this deployment strategy?