How Is the Dell EMC Unity XT Data Reduction Ratio

Multiple Choice

How is the Dell EMC Unity XT Data Reduction Ratio calculated?

A) Divide the predate-reduction size of all storage resources and their snapshots by the postdata-reduction size of all storage resources and their snapshots.
B) Add up the efficiencies gained from thin provisioning, Deduplication, and Compression.
C) Divide the predate-reduction size of all storage resources excluding their snapshots by the postdata-reduction size of all storage resources excluding their snapshots.
D) Add up the efficiencies gained from thin provisioning, Snapshots, and Compression.