Apex domains cannot have CNAME records.
Question and response
Question
dig gvpn.biz. NS
Answer
gvpn.biz. 5 NS ns2.gvpn.biz.
gvpn.biz. 5 NS ns1.gvpn.biz.
Authority
The response has no authority records.
Additional
ns1.gvpn.biz. 5 A 216.187.102.1
ns2.gvpn.biz. 5 A 216.187.102.202
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0