A company is moving its production Windows file server to AWS. The solution must remain available if an Availability Zone fails or during maintenance, support SMB access, and preserve Windows ACL-based file permissions. Which option satisfies these requirements?

Amazon FSx for Windows File Server provides fully managed, highly available, and scalable file storage built on Windows Server. Configuring it for Multi-AZ high availability ensures continuous operation even if an Availability Zone fails, meeting the availability requirement. It natively supports the Server Message Block (SMB) protocol and preserves Windows Access Control Lists (ACLs), directly addressing all specified needs. A single AWS Storage Gateway File Gateway instance is a single point of failure and doesn't meet the Multi-AZ availability requirement. Deploying two File Gateways with an Application Load Balancer is not a standard or efficient solution for SMB file sharing and doesn't inherently manage file consistency or ACLs across instances. Deploying two single-AZ Amazon FSx for Windows file systems with Microsoft DFS Replication (DFSR) adds complexity, management overhead, and potential replication latency, making the native Multi-AZ FSx solution superior for simplicity and reliability.