When adding additional users to a file’s extended ACLs, what is true about the default behaviour of
the ACL mask for the file?

A.
The mask is modified to be the union of all permissions of the file owner, owning group and all
named users and groups.

B.
The mask is left unchanged.

C.
If required, a warning is printed indicating that the mask is too restrictive for the permissions
being granted.

D.
The mask is modified to be the union of all permissions of the owning group and all named users
and groups.