3) solved using minimal-responses yes; option which defaults to no
Tested in private namespace and results speaks that its [-o< done.
Below is Pro DNS and BIND excerpt
minimal-responsesminimal-responses ( yes | no ) ;
minimal-responses yes ;
If minimal-responses is set to yes, the server will only add records to the authority and additional data sections (see Chapter 15) when they are required by the protocol, specifically delegations and negative responses. Since the effect of this is to reduce the data volumes sent, it may improve the performance of the server. The BIND default is no. This statement may be used in a view or global zone clause.