Apex domains cannot have CNAME records.
Question and response
Question
dig itarian.com. NS
Answer
itarian.com. 4 NS ns-2025.awsdns-61.co.uk.
itarian.com. 4 NS ns-106.awsdns-13.com.
itarian.com. 4 NS ns-647.awsdns-16.net.
itarian.com. 4 NS ns-1317.awsdns-36.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0