Apex domains cannot have CNAME records.
Question and response
Question
dig techbriefsmedia.com. NS
Answer
techbriefsmedia.com. 5 NS ns-235.awsdns-29.com.
techbriefsmedia.com. 5 NS ns-1875.awsdns-42.co.uk.
techbriefsmedia.com. 5 NS ns-1115.awsdns-11.org.
techbriefsmedia.com. 5 NS ns-1017.awsdns-63.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0