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 GroupDesiredCapacitymetric
C. Use a target tracking scaling policy based on the ALB’s ActiveConnectionCountmetric
D. Use a target tracking scaling policy based on the ALB’s RequestCountPerTargetmetric