You work as an architect for a company. There is a requirement for an application to be deployed on a set of EC2 Instances. These would be part of a compute cluster that requires low inter-node latency. Which of the following would you use for this requirement?

Answer options:

A.Multiple Availability Zones
B.AWS Direct Connect
C.EC2 Dedicated Instances
D.Cluster placement Groups
E.VPC private subnets

Answer – D
The AWS Documentation mentions the following.
Amazon Web Services` solution to reduce latency between instances involves the use of placement groups. As the name implies, a placement group is just that -- a group. AWS instances that exist within a common availability zone can be grouped into a placement group. Group members can communicate with one another in a way that provides low latency and high throughput.
Cluster Placement groups are recommended for applications that benefit from low network latency, high network throughput, or both. The majority of the network traffic is between the instances in the group. To provide the lowest latency and the highest packet-per-second network performance for your placement group, choose an instance type that supports enhanced networking.
Because of what is mentioned in the documentation, all other options are incorrect.
For more information on AWS placement groups, please visit the URL-
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html