How does VNX data compress storage pool LUNs?

A storage administrator wants to enable data compression on inactive backup volumes that are configured on storage pool LUNs.
How does VNX data compress storage pool LUNs?
A. Storage pool LUNs are compressed in place.
B. Storage pool LUNs are migrated to a new storage pool LUN with the compression attribute enabled.
C. VNX does not support compression of storage pool LUNs.
D. Storage pool LUNs are migrated to a new RAID-group LUN with the compression attribute enabled.

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