Which of the following statements about SWF are true?

Which of the following statements about SWF are true? Choose 3 answers

A.
SWF uses deciders and workers to complete tasks

B.
SWF requires at least 1 EC2 instance per domain

C.
SWF triggers SNS notifications on task assignment

D.
SWF requires an S3 bucket for workflow storage

E.
SWF tasks are assigned once and never duplicated

F.
SWF workflow executions can last up to a year