Which AWS service is a hybrid cloud storage service that provides on-premises users access to virtually unlimited cloud storage?

Explanations:

AWS DataSync is primarily used for transferring data between on-premises storage and AWS storage services. It does not provide a hybrid cloud storage solution that allows on-premises users direct access to cloud storage.

Amazon S3 Glacier is a cloud storage service designed for archival storage and data that is infrequently accessed. It does not provide on-premises users direct access and is not a hybrid cloud storage solution.

AWS Storage Gateway is specifically designed to connect on-premises environments with cloud storage. It provides hybrid cloud storage by enabling on-premises applications to access virtually unlimited cloud storage through various gateway types.

Amazon Elastic Block Store (EBS) provides block storage for use with Amazon EC2 instances. It is not designed for hybrid cloud access and does not offer direct access for on-premises users to cloud storage.