What is a placement group in Amazon EC2?

What is a placement group in Amazon EC2?
A .  It is a group of EC2 instances within a single Availability Zone.
B .  It the edge location of your web content.
C .  It is the AWS region where you run the EC2 instance of your web content.
D .  It is a group used to span multiple Availability Zones.

Answer: A

Explanation:

A placement group is a logical grouping of instances within a single Availability Zone.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html

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