Apex domains cannot have CNAME records.
Question and response
Question
dig monzavira.com. NS
Answer
monzavira.com. 5 NS ns-129.awsdns-16.com.
monzavira.com. 5 NS ns-904.awsdns-49.net.
monzavira.com. 5 NS ns-239.awsdns-29.com.
monzavira.com. 5 NS ns-1448.awsdns-53.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0