AWS Certified Developer – Associate — Question 235

A developer is deploying a company's application to Amazon EC2 instances. The application generates gigabytes of data files each day. The files are rarely accessed, but the files must be available to the application’s users within minutes of a request during the first year of storage. The company must retain the files for 7 years.

How can the developer implement the application to meet these requirements MOST cost-effectively?

Answer options

• A. Store the files in an Amazon S3 bucket Use the S3 Glacier Instant Retrieval storage class. Create an S3 Lifecycle policy to transition the files to the S3 Glacier Deep Archive storage class after 1 year.
• B. Store the files in an Amazon S3 bucket. Use the S3 Standard storage class. Create an S3 Lifecycle policy to transition the files to the S3 Glacier Flexible Retrieval storage class after 1 year.
• C. Store the files on an Amazon Elastic Block Store (Amazon EBS) volume. Use Amazon Data Lifecycle Manager (Amazon DLM) to create snapshots of the EBS volumes and to store those snapshots in Amazon S3.
• D. Store the files on an Amazon Elastic File System (Amazon EFS) mount. Configure EFS lifecycle management to transition the files to the EFS Standard-Infrequent Access (Standard-IA) storage class after 1 year.

Correct answer: A

Explanation

The correct answer is A because using Amazon S3 with the Glacier Instant Retrieval storage class allows for immediate access to files while transitioning them to a more cost-effective Glacier Deep Archive after a year. Options B and D are less cost-effective as they do not leverage the cheaper long-term storage options as efficiently. Option C is not suitable because EBS volumes are not optimal for large-scale data retention compared to S3.