Following the acquisition of EuroTech Solutions by American Retail Corp, the Cloud Infrastructure team needs to connect a new microservices application hosted across five VPCs in us-east-2 to resources in a single VPC in EuroTech's eu-west-1 AWS environment, ensuring no other VPCs are accessible and optimizing for cost, given that all accounts are in the same AWS Organization and VPCs have non-overlapping CIDR ranges. Which solution will meet these requirements MOST cost-effectively?