Apex domains cannot have CNAME records.
Question and response
Question
dig netavous.net. NS
Answer
netavous.net. 5 NS ns2.sd-france.net.
netavous.net. 5 NS srv4.netavous.net.
Authority
The response has no authority records.
Additional
srv4.netavous.net. 5 A 81.93.250.111
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0