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The infrastructure team at CloudSolutions Inc. is migrating to AWS Systems Manager Patch Manager for patching EC2 instances in their application account. Currently, patching relies on internet access via a NAT gateway, but CloudSolutions Inc. wants to use a patch source repository in a core account while completely restricting internet access for application EC2 instances that need access to S3, Systems Manager, and the core account's patch source repository. Which solution will meet these requirements?