Which conditions must be met before tree quotas can be enabled?

A.
File system and parent directories must exist, but the parent directory on which the tree quota is to be applied must already exist.

B.
File system and parent directories must exist, but the parent directory on which the tree quota is to be applied must not exist.

C.
Tree directory structure to be quoted must be populated with data.

D.
Tree directory structure to be quoted must be at the root of the file system.