A company runs an application on a group of Amazon Linux EC2 instances. For compliance reasons, the company must retain all application log files for 7 years. The log files will be analyzed by a reporting tool that must be able to access all the files concurrently. Which storage solution meets these requirements MOST cost-effectively?

1. Amazon Elastic Block Store (Amazon EBS)
2. Amazon Elastic File System (Amazon EFS)
3. Amazon EC2 instance store
4. Amazon S3