A media company is developing a new application which will be supported by mobile devices, tablets, and desktops. Each platform is customized for a different user experience and various viewing modes based on the resources being requested by users. This is enabled by path-based routing behind the scenes, using instances deployed on Amazon EC2. An auto scaling group has been configured to ensure EC2 instances are highly scalable. Which of the following combinations will ensure high performance and minimal cost? (Select TWO.)