How many hierarchical snapshots are supported by Dell EMC Unity?

How many hierarchical snapshots are supported by Dell EMC Unity?
A . 16 levels deep for LUNs
16 levels deep for filesystems
B . 16 levels deep for LUNs
8 levels deep for filesystems
C . 32 levels deep for LUNs
16 levels deep for filesystems
D . 10 levels deep for LUNs
10 levels deep for filesystems

Answer: D