Apex domains cannot have CNAME records.
Question and response
Question
dig glhec.org. NS
Answer
glhec.org. 5 NS ns-1003.awsdns-61.net.
glhec.org. 5 NS ns-1185.awsdns-20.org.
glhec.org. 5 NS ns-1939.awsdns-50.co.uk.
glhec.org. 5 NS ns-304.awsdns-38.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0