Apex domains cannot have CNAME records.
Question and response
Question
dig biocoopanduze.fr. NS
Answer
biocoopanduze.fr. 5 NS ns1.biocoopanduze.fr.
biocoopanduze.fr. 5 NS ns2.biocoopanduze.fr.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0