A. Create two private subnets within the same VPC. Communicate between instances using their private IP addresses
B. Create 2 public subnets within the same VPC. Communicate between instances using their public IP addresses
C. Create 2 separate VPCs, one for each Availability Zone. Create a private subnet within each VPC. Create a static route table pointing the destination CIDR to the other VPC
D. Create 2 separate VPCs, one for each Availability Zone and create a public subnet in each. Deploy a VPN appliance within each VPC and establish a VPN tunnel between them. Communicate between instances by routing traffic through the VPN appliances

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