Apex domains cannot have CNAME records.
Question and response
Question
dig southernresourcemapping.com. NS
Answer
southernresourcemapping.com. 5 NS ns-1534.awsdns-63.org.
southernresourcemapping.com. 5 NS ns-2.awsdns-00.com.
southernresourcemapping.com. 5 NS ns-118.awsdns-14.com.
southernresourcemapping.com. 5 NS ns-1176.awsdns-19.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0