Apex domains cannot have CNAME records.
Question and response
Question
dig Gawex.PL. NS
Answer
Gawex.PL. 5 NS DNS.Gawex.PL.
Gawex.PL. 5 NS NS1.Gawex.PL.
Authority
The response has no authority records.
Additional
dns.gawex.pl. 5 A 84.205.31.2
ns1.gawex.pl. 5 A 89.239.127.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0