AWS Certified Solutions Architect Associate Test 4

Explanation:
Auto Scaling is an AWS service that allows you to increase or decrease the number of EC2 instanceswithin your application's architecture. With Auto Scaling, you create collections of EC2 instances,called Auto Scaling groups. You can create these groups from scratch, or from existing EC2 instancesthat are already in production.
Reference:
http://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html#limits_autoscaling