Apex domains cannot have CNAME records.
Question and response
Question
dig nevisinternet.net. NS
Answer
nevisinternet.net. 2 NS thomas.ns.cloudflare.com.
nevisinternet.net. 2 NS addilyn.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0