Apex domains cannot have CNAME records.
Question and response
Question
dig quarabs.org. NS
Answer
quarabs.org. 1 NS ns-1034.awsdns-01.org.
quarabs.org. 1 NS ns-991.awsdns-59.net.
quarabs.org. 1 NS ns-178.awsdns-22.com.
quarabs.org. 1 NS ns-591.awsdns-09.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0