Exam AWS Certified SysOps Administrator - Associate topic 1 question 417 discussion

To configure the Auto Scaling group to scale out as soon as CPU utilization rises above 50% for the instances, you should: C. Configure the Auto Scaling group to scale dynamically based on demand.

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html

Answer C: https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html

Scale based on demand A more advanced way to scale your resources, using dynamic scaling, lets you define a scaling policy that dynamically resizes your Auto Scaling group to meet changes in demand. For example, let's say that you have a web application that currently runs on two instances and you want the CPU utilization of the Auto Scaling group to stay at around 50 percent when the load on the application changes. This method is useful for scaling as traffic changes occur, when you don't know when the traffic will change. You can configure scaling policies to respond for you. There are multiple policy types (or a combination of them) that you can use to scale in response to traffic changes. For more information, see Dynamic scaling for Amazon EC2 Auto Scaling. https://docs.aws.amazon.com/autoscaling/ec2/userguide/scaling-overview.html