A company is running a new promotion that will result in a massive spike in traffic for a single application. The SysOps Administrator must prepare the application and ensure that the customers have a great experience. The application is heavy on memory and is running behind an AWS Application Load Balancer (ALB). The ALB has been pre-warmed, and the application is in an Auto Scaling group.
What built-in metric should be used to control the Auto Scaling group’s scaling policy?

A. RejectedConnection Count
B. Request CountPerTarget
C. CPUUtilization
D. MemoryUtilization