What is the MOST cost-effective solution1?

A solutions architect is tasked with transferring 750 TB of data from a network-attached file system located at a branch office to Amazon S3 Glacier. The solution must avoid saturating the branch office’s low-bandwidth internet connection.

What is the MOST cost-effective solution1?
A . Create a site-to-site VPN tunnel to an Amazon S3 bucket and transfer the files directly.
Create a bucket policy to enforce a VPC endpoint.
B . Order 10 AWS Snowball appliances and select an S3 Glacier vault as the destination.
Create a bucket policy to enforce a VPC endpoint.
C . Mount the network-attached file system to Amazon S3 and copy the files directly.
Create a lifecycle policy to transition the S3 objects to Amazon S3 Glacier.
D . Order 10 AWS Snowball appliances and select an Amazon S3 bucket as the destination.
Create a lifecycle policy to transition the S3 objects to Amazon S3 Glacier.

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Answer: D