Apex domains cannot have CNAME records.
Question and response
Question
dig bakarokna.pl. NS
Answer
bakarokna.pl. 5 NS ns2.cyberfolks.pl.
bakarokna.pl. 5 NS ns1.cyberfolks.pl.
bakarokna.pl. 5 NS ns3.cyberfolks.pl.
Authority
The response has no authority records.
Additional
ns1.cyberfolks.pl. 5 A 94.152.254.111
ns2.cyberfolks.pl. 5 A 94.152.255.111
ns3.cyberfolks.pl. 5 A 94.152.254.161
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0