Which replacement to the on-premises file share is MOST resilient and durable?

Explanations:

Amazon RDS is a managed relational database service and is not suitable for file shares. It is designed for structured data and does not provide file storage capabilities that a web application would require.

AWS Storage Gateway provides a bridge between on-premises applications and cloud storage, but it is primarily used for caching and hybrid cloud storage solutions. It does not offer the same level of durability and resilience as other options specifically designed for file shares.

Amazon FSx for Windows File Server provides a fully managed native Windows file system that is compatible with the SMB protocol. It is designed for applications that require file storage and supports features such as automatic backups, high availability, and resilience across multiple Availability Zones, making it the best option for replacing an on-premises file share.

Amazon Elastic File System (EFS) is a fully managed file storage service for use with AWS Cloud services and on-premises resources. While it is durable and scalable, it is designed primarily for Linux-based workloads and may not support the native Windows file-sharing features required by a Windows IIS application as effectively as FSx for Windows File Server.