Which of the Following Is Correct? (Choose All That Apply

Which of the following is correct? (Choose all that apply.)

A) SmartTier supports a High Performance, a Performance, a High Capacity and a Capacity Tier.
B) Only when a snapshot is activated will the system record all changes to the original LUN.
C) To write data to the secondary LUN of a clone pair, the pair must be split.
D) A snapshot needs to be removed from the LUN group to be fully unmapped.