Answer C
"Storage pools must maintain free capacity in order to operate properly. By default, Dell EMC Unity will raise an alert if a storage pool has less than 30% free capacity, and will begin to automatically invalidate Snapshots and Replication sessions if the storage pool has less than 5% free capacity. <<Dell Technologies recommends that a storage pool always have at least 10% free capacity.>>"
Pg. 15
Dell EMC Unity: Best Practices Guide
A is correct for sure!
https://www.delltechnologies.com/fr-ga/documentation/unity-family/unity-p-pool-config/01-unity-pool-br-intro-to-pools.htm
Hybrid Pools
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