Your company runs a high-end and a long-running analytics pipeline on your on-premises data centers. The solution uses clusters of high configuration machines that are connected via a high throughput, low latency fiber network. Due to the periodic hardware and networking issues, the setup uses a replica of clusters for redundancy and failover purposes. The setup is now due for a major hardware upgrade and requires a considerable budget increase as well. The management has decided to evaluate if AWS can be used and check whether it is possible to replicate the same setup with low latency. Select two valid options to include in your suggestion.

Answer options:

A.Use the On-demand instances to minimize the cost.
B.Cluster Placement Groups
C.Placement Groups spread across two availability zones.
D.Use the Spot instances to minimize the cost.
E.Use the Reserved instances to minimize the cost.

Correct Answer: B and E
Option A is INCORRECT because using the On-demand instances might not be a cost-efficient option for running a long-running application.
Option B is CORRECT because this option achieves the low latency network necessary for tightly-coupled node-to-node communication between the virtual machines in the same Availability Zone.
Option C is INCORRECT because as such Partitioned Groups do span over Availability Zones, which will defeat the requirement of the application of low latency communication.
Option D is INCORRECT because the spot instances may not be ideal for long-running applications within the partition groups.
Option E is CORRECT because using the RI would be the best option to get some upfront discount for a long-running application.