When querying for records, ask the nameserver non-recursively, instead
of going through the full resolver logic. This parameter is useful
when you know that the default name server (or the supplied specific
nameserver) can respond correctly, which it typically only would if it
is responsible for the zone.
The original motivation for the -n parameter was to improve speed when
asking parents for NS records on delegated zones, which would make the
server recursively ask the child servers.