Answer: Amazon Elastic File System (EFS) Standard–IA storage class

Overall explanation Correct option: Amazon Elastic File System (EFS) Standard–IA storage class - Amazon EFS is a file storage service for use with Amazon compute (EC2, containers, serverless) and on-premises servers. Amazon EFS provides a file system interface, file system access semantics (such as strong consistency and file locking), and concurrently accessible storage for up to thousands of Amazon EC2 instances. The Standard–IA storage class reduces storage costs for files that are not accessed every day. It does this without sacrificing the high availability, high durability, elasticity, and POSIX file system access that Amazon EFS provides. AWS recommends Standard-IA storage if you need your full dataset to be readily accessible and want to automatically save on storage costs for files that are less frequently accessed. Incorrect options: Amazon S3 Standard-Infrequent Access (S3 Standard-IA) storage class - Amazon S3 is an object storage service. Amazon S3 makes data available through an Internet API that can be accessed anywhere. It is not a file storage service, as is needed in the use case. Amazon Elastic File System (EFS) Standard storage class - Amazon EFS Standard storage classes are ideal for workloads that require the highest levels of durability and availability. The EFS Standard storage class is used for frequently accessed files. It is the storage class to which customer data is initially written for Standard storage classes. The company is also looking at cutting costs by optimally storing the infrequently accessed data. Hence, EFS standard storage class is not the right solution for the given use case. Amazon Elastic Block Store (EBS) - Amazon EBS is a block-level storage service for use with Amazon EC2. Amazon EBS can deliver performance for workloads that require the lowest latency access to data from a single EC2 instance. EBS volume cannot be accessed by hundreds of EC2 instances concurrently. It is not a file storage service, as is needed in the use case.

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