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A logistics company receives nightly CSV files from 30 partners. Partners must keep their SFTP clients, each partner must access only its own files, and the company does not want to maintain transfer servers. Which architecture best meets the requirements?

Give every partner an IAM user and access to one shared S3 prefix.Run one SFTP server on a single EC2 instance with an attached EBS volume.Email pre-signed S3 upload URLs to every partner each night.Use AWS Transfer Family backed by S3, with per-partner identities and roles scoped to separate incoming prefixes.