A company runs multiple Windows workloads on AWS. Employees use Windows file shares hosted on two Amazon EC2 instances; the shares synchronize and keep duplicate copies. The company wants a highly available, durable storage solution that preserves the current user access method. What should a solutions architect do?

The correct solution is to extend the file share environment to Amazon FSx for Windows File Server with a Multi-AZ configuration and migrate the data. FSx for Windows File Server provides fully managed, highly available, and durable file storage that is natively compatible with Windows file shares (SMB protocol) and Active Directory, preserving the current user access method. A Multi-AZ deployment ensures high availability. Migrating to Amazon S3 would require rewriting applications and changing user access methods, as S3 is an object storage service, not a file share. Setting up an Amazon S3 File Gateway on existing EC2 instances would still rely on the EC2 instances for file serving, which doesn't inherently provide the desired high availability and durability for the file share itself. Amazon EFS is designed for Linux-based workloads and uses the NFS protocol, making it incompatible with Windows file shares and Active Directory authentication without significant workarounds.