Apex domains cannot have CNAME records.
Question and response
Question
dig caltaverner.com. NS
Answer
caltaverner.com. 1 NS ns1.caltaverner.com.
caltaverner.com. 1 NS ns2.caltaverner.com.
Authority
The response has no authority records.
Additional
ns1.caltaverner.com. 1 A 144.217.162.99
ns2.caltaverner.com. 1 A 51.161.91.47
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0