Apex domains cannot have CNAME records.
Question and response
Question
dig privex.cc. NS
Answer
privex.cc. 5 NS ns1.privex.io.
privex.cc. 5 NS ns3.privex.io.
privex.cc. 5 NS ns2.privex.io.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0