Apex domains cannot have CNAME records.
Question and response
Question
dig ksduino.org. NS
Answer
ksduino.org. 3 NS ns-1764.awsdns-28.co.uk.
ksduino.org. 3 NS ns-719.awsdns-25.net.
ksduino.org. 3 NS ns-238.awsdns-29.com.
ksduino.org. 3 NS ns-1079.awsdns-06.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0