Which of the following statements about SWF are true?

Which of the following statements about SWF are true? (Choose three.)

A.
SWF tasks are assigned once and never duplicated

B.
SWF requires an S3 bucket for workflow storage

C.
SWF workflow executions can last up to a year

D.
SWF triggers SNS notifications on task assignment

E.
SWF uses deciders and workers to complete tasks

F.
SWF requires at least 1 EC2 instance per domain