Apex domains cannot have CNAME records.
Question and response
Question
dig cyberhost.biz. NS
Answer
cyberhost.biz. 4 NS jean.ns.cloudflare.com.
cyberhost.biz. 4 NS paul.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0