Apex domains cannot have CNAME records.
Question and response
Question
dig harat.com.pl. NS
Answer
harat.com.pl. 4 NS wns1.harat.com.pl.
harat.com.pl. 4 NS wns2.harat.com.pl.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0