In order to optimize performance for a compute cluster that requires low inter-node latency, which feature in the following list should you use?

Answer options:

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

Answer – B
A placement group is a logical grouping of instances within a single Availability Zone. Placement groups are recommended for applications that benefit from low network latency, high network throughput, or both. 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
For more information on placement groups please visit the URL:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html