AWS Certified Solutions Architect Associate Test 7

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