George has launched three EC2 instances inside the US-East-1a zone with his AWS account. Ray has
launched two EC2 instances in the US-East-1a zone with his AWS account. Which of the below mentioned
statements will help George and Ray understand the availability zone (AZ. concept better?

A.
The instances of George and Ray will be running in the same data center

B.
All the instances of George and Ray can communicate over a private IP with a minimal cost

C.
All the instances of George and Ray can communicate over a private IP without any cost

D.
The US-East-1a region of George and Ray can be different availability zones

Explanation:
Each AWS region has multiple, isolated locations known as Availability Zones. To ensure that the AWS
resources are distributed across the Availability Zones for a region, AWS independently maps the Availability
Zones to identifiers for each account. In this case the Availability Zone US-East-1a where George’s EC2
instances are running might not be the same location as the US-East-1a zone of Ray’s EC2 instances. There is
no way for the user to coordinate the Availability Zones between accounts.