Apex domains cannot have CNAME records.
Question and response
Question
dig lasvegasgolfandtennis.com. NS
Answer
lasvegasgolfandtennis.com. 5 NS ns-680.awsdns-21.net.
lasvegasgolfandtennis.com. 5 NS ns-1530.awsdns-63.org.
lasvegasgolfandtennis.com. 5 NS ns-1773.awsdns-29.co.uk.
lasvegasgolfandtennis.com. 5 NS ns-19.awsdns-02.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0