An administrator has a heavily used VNX system that houses multiple applications. They just discovered the
tree quota feature, and have decided to implement it for their existing data.
Which is a valid concern about this situation?

A.
File systems must be taken offline for the initial quota usage calculations

B.
Tree quota capabilities must be set at the time of file system creation

C.
Existing data may already exceed the quota setting

D.
Tree quotas can be created only in empty directories