What Technology, Used by Dell EMC Unity XT Snapshots, Is

Multiple Choice

What technology, used by Dell EMC Unity XT Snapshots, is accurately described?

A) Copy on First Write requires a storage resource reserved to hold original data that changed to preserve the point-in-time view
B) Redirect on Write requires a storage resource reserved to hold original data that changed to preserve the point-in-time view
C) Redirect on write requires no storage resource to create a Snapshot, writes are redirected on parent pool
D) Copy on First Write requires no storage resource to create a Snapshot, writes are copied to parent pool