שאלה | How do Amazon EC2 Auto Scaling groups help achieve high availability for a web application?

How do Amazon EC2 Auto Scaling groups help achieve high availability for a web application?

		They automatically add more instances across multiple AWS Regions based on global demand of the application.
		They automatically add or replace instances across multiple Availability Zones when the application needs it.
		They enable the application's static content to reside closer to end users.
		They are able to distribute incoming requests across a tier of web server instances.