Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 844 discussion

B is incorrect in this case because the development team doesn’t have time to modify the application.

Amazon FSx for Windows File Server also support SMB and hybrid solution. And, no modification is needed.

Why not "Amazon FSx for Windows File Server"?

AnswerD StorageGateway https://docs.aws.amazon.com/storagegateway/

AWS Storage Gateway provides a set of hybrid cloud storage services that offer on-premises access to virtually unlimited cloud storage. The File Gateway configuration of AWS Storage Gateway supports the SMB protocol (and NFS), enabling on-premises applications to seamlessly store and retrieve files in Amazon S3 using existing file system protocols. It fits perfectly for applications that need to continue operating without modification, while also adhering to the new policy of copying files to AWS. Given these descriptions, Option D (AWS Storage Gateway) is the recommended service. It allows for a smooth integration by maintaining the existing SMB file-sharing capabilities and connects seamlessly to AWS through the VPN, enabling daily file transfers without significant changes to application code or infrastructure.

AWS Storage Gateway service enables hybrid storage between on-premises environments and the AWS Cloud. It provides low-latency performance by caching frequently accessed data on premises, while storing data securely and durably in Amazon cloud storage services.

https://docs.aws.amazon.com/storagegateway/