Apex domains cannot have CNAME records.
Question and response
Question
dig valentines-greetings.com. NS
Answer
valentines-greetings.com. 5 NS ns9.dnsmadeeasy.com.azure-dns.info.
valentines-greetings.com. 5 NS ns1.dnsmadeeasy.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0