Explanation

Amazon FSx for Windows File Server is the correct choice because:

• Fully Managed: Amazon FSx is a fully managed service that handles all the underlying infrastructure, patching, and maintenance
• Native Microsoft Support: It's specifically designed for Windows file systems and Microsoft workloads
• SMB Protocol Support: It natively supports the Server Message Block (SMB) protocol, which is essential for Windows file sharing
• Windows File Server Features: Provides features like Active Directory integration, distributed file system (DFS), and Windows permissions

Why not the other options:

• Amazon EFS: Primarily designed for Linux workloads and uses NFS protocol, not SMB
• Amazon FSx for Lustre: Optimized for high-performance computing and uses Lustre file system, not Windows file systems
• Amazon EBS: Block storage service that requires you to manage the file system yourself, not a managed file server

Amazon FSx for Windows File Server provides a fully managed Windows file server experience with native SMB protocol support, making it ideal for Microsoft workloads.