Which AWS service will meet these requirements?
Amazon Elastic File System (Amazon EFS)
Amazon S3
Amazon Elastic Block Store (Amazon EBS)
Amazon FSx for Windows File Server
Explanations:
Amazon EFS is designed for simultaneous access by multiple EC2 instances across different Availability Zones, making it ideal for shared file systems.
Amazon S3 is an object storage service and does not support mounting as a file system directly on EC2 instances. It is more suited for storing and retrieving data rather than providing a shared file system interface.
Amazon EBS provides block storage that can only be attached to a single EC2 instance at a time, making it unsuitable for simultaneous access from multiple instances.
Amazon FSx for Windows File Server is primarily for Windows-based workloads and does not natively support Linux instances as well as EFS does for a shared file system environment.