On an EMC Data Domain system, what is the role of file system cleaning?

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On an EMC Data Domain system, what is the role of file system cleaning?
A . Remove all traces of a file to resolve classified message incidents
B . Remove unreferenced segments from physical storage
C . Eliminate older snapshots if the file system exceeds 90% utilization
D . Delete data from VTL cartridges that have been marked as expired

Answer: D