You must design an architecture for an HPC workload where EC2 instances require 10 Gbps flows and up to 100 Gbps aggregate throughput across many instances with low-latency communication. Which deployment optimizes this workload?

The correct option optimizes for high-throughput, low-latency HPC workloads. A cluster placement group ensures instances are physically close together within a single Availability Zone, minimizing network latency. Placing them in a single subnet simplifies networking and reduces routing overhead. Elastic Fabric Adapter (EFA) is crucial as it provides OS bypass capabilities and direct access to the network interface, delivering significantly lower latency and higher throughput compared to traditional TCP networking, essential for 10 Gbps flows and 100 Gbps aggregate throughput. Incorrect options: Multiple subnets and a spread placement group increase latency and do not guarantee the physical proximity needed for HPC. ENA is a general-purpose network adapter, not optimized for the extreme low latency of EFA. Multiple VPCs connected by Transit Gateway introduce significant latency, unsuitable for HPC. Multiple Availability Zones inherently increase latency due to physical separation, and ENA does not provide the performance required.