Amazon Simple Storage Service (Amazon S3) provides object storage, Amazon Elastic Block Store (Amazon EBS) offers block storage, and Amazon Elastic File System (Amazon EFS) delivers file storage is correct because these services correspond directly to the object block and file storage models used in cloud architectures.

Amazon S3 stores data as objects in buckets so each object carries its data and metadata and it is ideal for unstructured data archives and media. Amazon EBS provides raw block devices that attach to EC2 instances and these are suitable for operating system volumes and databases. Amazon EFS offers a managed POSIX style file system that multiple instances can mount for shared file access and typical file workloads.

Amazon Simple Storage Service (Amazon S3) is file storage, Amazon Elastic Block Store (Amazon EBS) is block storage, and Amazon Elastic File System (Amazon EFS) is object storage is wrong because it treats S3 as a file system and it claims EFS is an object store which is not correct.

Amazon Simple Storage Service (Amazon S3) offers object storage, Amazon Elastic Block Store (Amazon EBS) is file storage, and Amazon Elastic File System (Amazon EFS) is block storage is incorrect because it swaps the roles of EBS and EFS and EBS does not provide a file system and EFS does not provide raw block devices.

Amazon Simple Storage Service (Amazon S3) is block storage, Amazon Elastic Block Store (Amazon EBS) is object storage, and Amazon Elastic File System (Amazon EFS) is file storage is invalid because it reverses the responsibilities of S3 and EBS and S3 is not block storage and EBS is not an object store.

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