A company plans to create a data lake that uses Amazon S3. Which... (CLF-C02)

Correct answer: A) The selection of S3 storage tiers.
The selection of Amazon S3 storage tiers will have the most significant effect on cost when creating a data lake using Amazon S3. Amazon S3 offers different storage classes or tiers, each with its own pricing structure. The choice of storage class depends on factors such as access frequency, durability requirements, and retrieval times.

For example, the Standard storage class is designed for frequently accessed data and has a higher cost per gigabyte compared to the Standard-IA (Infrequent Access) or Glacier storage classes, which are more cost-effective for less frequently accessed data. The storage tier selection directly influences the overall cost of storing data in Amazon S3.

Options B (Charges to transfer existing data into Amazon S3), C (The addition of S3 bucket policies), and D (S3 ingest fees for each request) can also contribute to costs, but they are generally not as significant as the choice of storage class for ongoing storage costs. Transfer costs, bucket policies, and ingest fees are additional considerations that depend on the specific use case and requirements of the data lake.