A company hosts an application that allows authorized users to upload and download documents. The application uses Amazon EC2 instances and an Amazon Elastic File System (Amazon EFS) file system. The company plans to deploy the application into a second AWS Region. The company will launch a new EFS file system and a new set of EC2 instances in the second Region. A solutions architect must develop a highly available and fault-tolerant solution to establish two-way synchronization across the Regions. Which solution will meet these requirements?