A Company Runs Multiple Amazon EC2 Linux Instances in a VPC

Multiple Choice

A company runs multiple Amazon EC2 Linux instances in a VPC with applications that use a hierarchical directory structure. The applications need to rapidly and concurrently read and write to shared storage. How can this be achieved?

A) Create an Amazon EFS file system and mount it from each EC2 instance.
B) Create an Amazon S3 bucket and permit access from all the EC2 instances in the VPC.
C) Create a file system on an Amazon EBS Provisioned IOPS SSD (101) volume. Attach the volume to all the EC2 instances.
D) Create file systems on Amazon EBS volumes attached to each EC2 instance. Synchronize the Amazon EBS volumes across the different EC2 instances.