Answer: Configure the Requester Pays feature on the company's S3 bucket.

## Explanation **Correct Answer: A - Configure the Requester Pays feature on the company's S3 bucket.** **Why this is correct:** 1. **Requester Pays feature** shifts the cost of data transfer from the bucket owner to the requester (in this case, the European marketing firm). 2. When the marketing firm accesses data from the company's S3 bucket, they will pay for the data transfer costs instead of the survey company. 3. This directly addresses the requirement to keep the company's data transfer costs as low as possible. **Why other options are incorrect:** **B. Configure S3 Cross-Region Replication from the company's S3 bucket to one of the marketing firm's S3 buckets.** - This would incur data transfer costs for the company when replicating data from US to Europe. - The company would pay for both data transfer and storage costs for the replicated data. **C. Configure cross-account access for the marketing firm so that the marketing firm has access to the company's S3 bucket.** - While this allows access, the company would still pay for data transfer costs when the marketing firm downloads data. - Data transfer costs would be incurred by the bucket owner (the survey company). **D. Configure the company's S3 bucket to use S3 Intelligent-Tiering. Sync the S3 bucket to one of the marketing firm's S3 buckets.** - S3 Intelligent-Tiering optimizes storage costs, not data transfer costs. - Syncing data would incur data transfer costs for the company. - This solution doesn't address the core requirement of minimizing data transfer costs. **Key AWS Concepts:** - **Requester Pays**: When enabled, the requester pays for data transfer and request costs instead of the bucket owner. - **Data Transfer Costs**: In AWS, data transfer OUT from AWS to the internet incurs costs, and these costs vary by region. - **Cross-Region Data Transfer**: Transferring data between regions (US to Europe) incurs additional costs. This solution is the most cost-effective for the survey company as it transfers the cost burden to the marketing firm that is accessing the data.

Author: LeetQuiz Editorial Team