Your organization is planning to shift one of the high-performance data analytics applications running on Linux servers purchased from the 3rd party vendor to the AWS. Currently, the application works in an on-premises load balancer, and all the data is stored in a very large shared file system for low-latency and high throughput purposes. The management wants minimal disruption to existing service and also wants to do stepwise migration for easy rollback. Please select 3 valid options from below.

Answer options:

A.Save all the data on S3 and use it as shared storage. Use an application load balancer with EC2 instances to share the processing load.
B.Create a RAID 1 storage using EBS and run the application on EC2 with application-level load balancers to share the processing load.
C.Use the VPN or Direct Connect to create a link between your company premise and AWS regional data center.
D.Create an EFS with provisioned throughput and share the storage between your on-premise instances and EC2 instances.
E.Setup a Route 53 record to distribute the load between on-premises and AWS load balancer with the weighted routing policy.

Correct Answer: C, D, E
Options C, D, and E are correct because network extension via VPN or Direct Connect will allow the on-premises instances to use the AWS resources like EFS. EFS is elastic file storage that can be mounted on EC2 and other instances. It is inherently durable and scalable. EFS stores the data by default at multiple availability zones. With Route 53 Weighted policy, the requests can be distributed to on-premise and AWS resources easily in a controlled manner.
Option A is INCORRECT because S3 will work as shared, durable storage. But it may not be a suitable choice for low-latency, high throughput load processing. As the application cannot be easily modified, presenting the S3 as a local file system will be another task and has to be done via File Storage Gateway.
Option B is INCORRECT because the purpose is to use a shared file system solution (EFS). RAID1 for EBS is not necessary as the application requires data from EFS rather than the local storage.