Apex domains cannot have CNAME records.
Question and response
Question
dig cartersalesco.com. NS
Answer
cartersalesco.com. 5 NS ns-567.awsdns-06.net.
cartersalesco.com. 5 NS ns-596.awsdns-10.net.
cartersalesco.com. 5 NS ns-1961.awsdns-53.co.uk.
cartersalesco.com. 5 NS ns-148.awsdns-18.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0