You have been tasked with deploying FortiGate VMs in a highly available topology on the Amazon Web Services (AWS) cloud. The requirements for your deployment are as follows:
* You must deploy two FortiGate VMs in a single virtual private cloud (VPC), with an external elastic load balancer which will distribute ingress traffic from the internet to both FortiGate VMs in an active-active topology.
* Each FortiGate VM must have two elastic network interfaces: one will connect to a public subnet and other will connect to a private subnet.
* To maintain high availability, you must deploy the FortiGate VMs in two different availability zones.
How many public and private subnets will you need to configure within the VPC?