Apex domains cannot have CNAME records.
Question and response
Question
dig avito.pl. NS
Answer
avito.pl. 5 NS ns2.avitointernet.pl.
avito.pl. 5 NS ns1.avitointernet.pl.
Authority
The response has no authority records.
Additional
ns1.avitointernet.pl. 5 A 185.35.199.9
ns2.avitointernet.pl. 5 A 185.35.199.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0