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A healthcare company is developing a secure internal web portal hosted on AWS. The application must communicate with legacy systems that reside in the company's on-premises data centers. These data centers are connected to AWS via a site-to-site VPN. The company uses Amazon Route 53 as its DNS solution and requires the application to resolve private DNS records for the on-premises services from within its Amazon VPC. What is the MOST secure and appropriate way to meet these DNS resolution requirements?