What does a “Domain” refer to in Amazon SWF?

A.
A security group in which only tasks inside can communicate with each other

B.
A special type of worker

C.
A collection of related Workflows

D.
The DNS record for the Amazon SWF service

Explanation:
Domains provide a way of scoping Amazon SWF resources within your AWS account. All the components of a
workflow, such as the workflow type and activity types, must be specified to be in a domain. It is possible to
have more than one workflow in a domain; however, workflows in different domains cannot interact with each
other. http://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-domain.html