The answer is D.
(Cascade is Async and JUST FOR File, NO BLOCK)
Async File Enhancements Unity OE 5.0
• In the Unity OE 5.0 Release, two new advanced async file replication topologies were introduced:
– Fan-out Replication (“1 to Many Replication”)
› Up to 1:4 storage replication mapping for a single file storage resource
› Each replication session has its own defined RPO (5 mins – 1440 mins)
– Cascade Replication (“Multi-hop Replication”)
› Replicate to another tier or level from already replicated resource
› For each level, can use fan-out replication (up to 3 additional sites)
Unity Data Protect pdf (pag 21)
Cascade replication on a Dell Unity XT is a type of asynchronous replication that allows you to replicate a block resource from one site to multiple other sites
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