A company needs to provide employees with secure access to confidential files so that only authorized users can download them to their devices. The files are on an on-premises Windows file server that is running out of capacity because of increased remote usage. Which solution will meet these requirements?

The correct solution leverages Amazon FSx for Windows File Server, which provides fully managed, highly available, and scalable Windows file storage that is natively compatible with Windows applications and Active Directory. Integrating with the on-premises Active Directory allows employees to use their existing credentials for authentication and authorization, ensuring secure access to confidential files. AWS Client VPN provides secure, remote access to the AWS network, allowing authorized employees to download files from anywhere. Migrating to an EC2 instance in a public subnet with IP-based security groups is less secure and scalable, as employee IP addresses can change, and it exposes the server directly to the internet. Migrating to Amazon S3 with a private VPC endpoint requires a different access mechanism (like signed URLs or a custom application) and doesn't natively support the Windows file share experience or Active Directory integration for file-level permissions. A public VPC endpoint for S3 is not a standard or secure configuration for private file access.