Apex domains cannot have CNAME records.
Question and response
Question
dig mariadalton.com. NS
Answer
mariadalton.com. 5 NS ns-1756.awsdns-27.co.uk.
mariadalton.com. 5 NS ns-197.awsdns-24.com.
mariadalton.com. 5 NS ns-344.awsdns-43.com.
mariadalton.com. 5 NS ns-1260.awsdns-29.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0