What is a placement group?
A.
A collection of Auto Scaling groups in the same Region
B.
Feature that enables EC2 instances to interact with each other via nigh bandwidth, low latency connections
C.
A collection of Elastic Load Balancers in the same Region or Availability Zone
D.
A collection of authorized Cloud Front edge locations for a distribution
Explanation:
http://aws.amazon.com/ec2/faqs/