A placement group in Amazon EC2 is used to reduce network latency and increase network throughput between instances. By launching instances within a placement group, you can ensure that they are physically located close to each other in the same Availability Zone. This proximity helps to minimize the network latency between instances, making it beneficial for applications that require low-latency and high-bandwidth communication.
i would go with D - placement group of type Cluster can do this – packs instances close together inside an Availability Zone. This strategy enables workloads to achieve the low-latency network performance necessary for tightly-coupled node-to-node communication that is typical of HPC applications.
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