An application is running on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances are configured in an Amazon EC2 Auto Scaling group. A SysOps Administrator must configure the application to scale based on the number of incoming requests.
Which solution accomplishes this with the LEAST amount of effort?
A . Use a simple scaling policy based on a custom metric that measures the average active requests of all EC2 instances
B . Use a simple scaling policy based on the Auto Scaling group GroupDesiredCapacity metric
C . Use a target tracking scaling policy based on the ALB’s ActiveConnectionCount metric
D . Use a target tracking scaling policy based on the ALB’s RequestCountPerTarget metric
Answer: A