Which solution will meet these requirements?

Explanations:

A cluster placement group allows EC2 instances to be placed close together in the same Availability Zone, providing high-throughput, low-latency network connections. Enhanced networking support improves network performance, making this option ideal for the application’s requirements.

An Auto Scaling group is not necessary since the application does not require fault tolerance. While attaching extra network interfaces might improve performance, it doesn’t specifically address the need for low-latency, high-throughput connections between the instances like a placement group would.

A partition placement group is designed for distributed applications that require high availability and fault tolerance. It does not guarantee the same level of network performance between instances as a cluster placement group. Therefore, it does not meet the application’s low-latency, high-throughput requirements.

A spread placement group is used to distribute instances across different hardware to reduce correlated failures, but it does not provide the low-latency, high-throughput network performance required for the application. Additionally, attaching extra network interfaces does not address the core requirement.