Apex domains cannot have CNAME records.
Question and response
Question
dig cottonherrera.com. NS
Answer
cottonherrera.com. 5 NS ns-138.awsdns-17.com.
cottonherrera.com. 5 NS ns-1988.awsdns-56.co.uk.
cottonherrera.com. 5 NS ns-1499.awsdns-59.org.
cottonherrera.com. 5 NS ns-904.awsdns-49.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0