The AWS Storage Gateway service enables hybrid storage between on-premises environments and
the AWS Cloud. It provides low-latency performance by caching frequently accessed data on
premises, while storing data securely and durably in Amazon cloud storage services. AWS
Storage Gateway supports three storage interfaces: file, volume, and tape
File gateway provides a virtual on-premises file server, which enables you to store and
retrieve files as objects in Amazon S3
The volume gateway represents the family of gateways that support block-based volumes,
previously referred to as gateway-cached and gateway-stored modes
Tape Gateway (formerly known as Gateway Virtual Tape Library) is used for backup with
popular backup software
All other answers are bogus and use terms that are associated with Storage Gateways (S3,
block, cached)