A company needs a cost-effective solution to back up its on-premises file storage (supporting NFS) to Amazon S3, archiving data after 5 days. Disaster recovery necessitates retrieval within a few days.
The suggested answer is D: Using an AWS Storage Gateway file gateway, transferring files to S3, and applying an S3 Lifecycle rule to move files to S3 Glacier Deep Archive after 5 days. This is likely deemed the most cost-effective due to the lower cost of Glacier Deep Archive compared to other options, with acceptable retrieval times for disaster recovery.