AWS Certified Big Data - Specialty (#21)

A system needs to collect on-premises application spool files into a persistent storage layer in AWS. Each spool file is 2 KB. The application generates 1 M files per hour. Each source file is automatically deleted from the local server after an hour. What is the most cost-efficient option to meet these requirements?

Write file contents to an Amazon DynamoDB table.
Copy files to Amazon S3 Standard Storage.
Write file contents to Amazon ElastiCache.
Copy files to Amazon S3 infrequent Access Storage.