Which solution meets these requirements with the LEAST operational overhead?

A company is automating an order management application. The company’s development team has decided to use SFTP to transfer and store the business-critical information files. The files must be encrypted and must be highly available. The files also must be automatically deleted a month after they are created.

Which solution meets these requirements with the LEAST operational overhead?
A . Configure an Amazon S3 bucket with encryption enabled. Use AWS transfer for SFTP to securely transfer the files to the S3 bucket Apply an AWS Transfer for SFTP file retention policy to delete the files after a month
B . Install an SFTP service on an Amazon EC2 instance Mount an Amazon Elastic File System (Amazon EFS) file share on the EC2 instance. Enable cron to delete the files after a month
C . Configure an Amazon Elastic File System (Amazon EFS) file system with encryption enabled. Use AWS Transfer for SFTP to securely transfer the files to the EFS file system. Apply an EFS lifecycle policy to automatically delete the files after a month.
D . Configure an Amazon S3 bucket with encryption enabled. Use AWS Transfer for SFTP to securely transfer the files to the S3 bucket. Apply S3 Lifecycle rules to automatically delete the files after a month.

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Answer: D