Apex domains cannot have CNAME records.
Question and response
Question
dig belorunima.com. NS
Answer
belorunima.com. 5 NS ns-317.awsdns-39.com.
belorunima.com. 5 NS ns-517.awsdns-00.net.
belorunima.com. 5 NS ns-1965.awsdns-53.co.uk.
belorunima.com. 5 NS ns-201.awsdns-25.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0