A company plans to run a high performance computing (HPC) workload on Amazon EC2 instances that require low-latency network performance and high network throughput with tightly coupled node-to-node communication. Which solution meets these requirements?

A cluster placement group places EC2 instances in a single Availability Zone on the same underlying hardware, ensuring low network latency and high network throughput, which is critical for tightly coupled HPC workloads. Dedicated Instance tenancy ensures instances run on hardware dedicated to a single customer but does not guarantee low-latency networking between instances. Spot Instances are a cost-effective option but offer no guarantees regarding network performance or instance placement. On-Demand Capacity Reservations reserve capacity but do not influence network performance or instance proximity.