Apex domains cannot have CNAME records.
Question and response
Question
dig cml.pl. NS
Answer
cml.pl. 3 NS ns1.cml.pl.
cml.pl. 3 NS ns2.cml.pl.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0