Apex domains cannot have CNAME records.
Question and response
Question
dig arofcom.com. NS
Answer
arofcom.com. 4 NS ns-809.awsdns-37.net.
arofcom.com. 4 NS ns-2022.awsdns-60.co.uk.
arofcom.com. 4 NS ns-471.awsdns-58.com.
arofcom.com. 4 NS ns-1481.awsdns-57.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0