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

The file owner's permissions are not affected by the mask; thus, the mask's calculation does not include the owner's permissions.

The mask is typically recalculated by default when new named ACL entries are added to ensure it correctly reflects the maximum effective permissions for the extended ACLs.

While a warning might occur if the mask is too restrictive, this describes a potential outcome, not the default behavior of how the mask itself is modified during the addition of new ACL entries.

When adding new named ACL entries using `setfacl`, the mask entry is automatically recalculated to be the union of the permissions of the owning group (`group::`) and all named user (`user:name:`) and named group (`group:name:`) entries. This ensures the mask accurately reflects the maximum effective permissions for these categories.