What is the key difference between an availability zone and an edge location?

Answer options:

A.An availability zone is a grouping of AWS resources in a specific region. An edge location is a specific resource within the AWS region.
B.An availability zone is an isolated location within an AWS region, whereas an edge location will deliver cached content to the closest location to reduce latency.
C.Edge locations are used as control stations for AWS resources.
D.None of the above

Answer – B
In AWS, there are regions with each region separated in a separate geographic area. Each region has multiple, isolated locations known as Availability Zones. An availability zone is used to host resources in a specific region.
For more information on Regions and availability zone, please visit the URL:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html