Which option meets the requirements and MINIMIZES costs?

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A company must deploy multiple independent instances of an application.The front-end application is internet accessible.However, corporate policy stipulates that the backends are to be isolated from each other and the internet, yet accessible from a centralized administration server.The application setup should be automated to minimize the opportunity for mistakes as new instances are deployed.

Which option meets the requirements and MINIMIZES costs?

Use an AWS CloudFormation template to create identical IAM roles for each region. Use AWS CloudFormation StackSets to deploy each application instance by using parameters to customize for each instance, and use security groups to isolate each instance while permitting access to the central server.

Create each instance of the application IAM roles and resources in separate accounts by using AWS CloudFormation StackSets. Include a VPN connection to the VPN gateway of the central administration server.

Duplicate the application IAM roles and resources in separate accounts by using a single AWS CloudFormation template. Include VPC peering to connect the VPC of each application instance to a central VPC.

Use the parameters of the AWS CloudFormation template to customize the deployment into separate accounts. Include a NAT gateway to allow communication back to the central administration server.

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