Apex domains cannot have CNAME records.
Question and response
Question
dig selfdefenseclassescypress.com. NS
Answer
selfdefenseclassescypress.com. 5 NS ns2.selfdefenseclassescypress.com.
selfdefenseclassescypress.com. 5 NS ns1.selfdefenseclassescypress.com.
Authority
The response has no authority records.
Additional
ns1.selfdefenseclassescypress.com. 5 A 62.171.142.121
ns2.selfdefenseclassescypress.com. 5 A 62.169.19.112
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0