$20.$ Which statement accurately describes how Amazon EC$2$ Auto Scaling is used?

Amazon EC$2$ Auto scaling allows an application to automatically add resources, but it can't automatically scale them back down.

Amazon EC$2$ Auto scaling is useful for predictable workloads.

The size of an Amazon EC$2$ Auto Scaling group will scale up and down automatically based on its configuration and the number of instances can't be manually adjusted.

Amazon EC$2$ Auto Scaling is useful for dynamic, unpredictable workloads but doesn't add much value for predictable workloads.