An Application Is Running on Amazon EC2 Instances Behind an Application

Multiple Choice

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 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 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 RequestCountPerTarget