A development team is building an application with front-end and backend application tiers. Each tier consists of Amazon EC2 instances behind an ELB ClassicLoad Balancer. The instances run in Auto Scaling groups across multiple Availability Zones. The network team has allocated the 10.0.0.0/24 address space for this application. Only the front-end load balancer should be exposed to the Internet. There are concerns about the limited size of the address space and the ability of each tier to scale.What should the VPC subnet design be in each Availability Zone?