Apex domains cannot have CNAME records.
Question and response
Question
dig tsunami.pl. NS
Answer
tsunami.pl. 5 NS ophelia.ns.cloudflare.com.
tsunami.pl. 5 NS devin.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0