What is a correct statement concerning the use of ECS as an LTR solution with DD Cloud Tier?

What is a correct statement concerning the use of ECS as an LTR solution with DD Cloud Tier?
A . There can be up to four cloud units that make up the cloud tier
B . Backups are cloned to the cloud tier via the app-based policy
C . Mission critical applications are backed up first to the DD cloud tier
D . Data is moved directly from the active to ECS

Answer: B