A. Use a CloudFormation template in the member accounts to launch workloads. Configure the template to use the Fn::ImportValue function to obtain the subnet ID values.
B. Use a transit gateway in the VPC within Account-A. Configure the member accounts to use the transit gateway to access the subnets in Account-A to launch workloads.
C. Use AWS Resource Access Manager (AWS RAM) to share Account-A’s VPC subnets with the remaining member accounts. Configure the member accounts to use the shared subnets to launch workloads.
D. Create a peering connection between Account-A and the remaining member accounts. Configure the member accounts to use the subnets in Account-A through the VPC peering connection to launch workloads.

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