Apex domains cannot have CNAME records.
Question and response
Question
dig amenworld.com. NS
Answer
amenworld.com. 4 NS ns2.amen.fr.
amenworld.com. 4 NS paris.amen.fr.
Authority
The response has no authority records.
Additional
ns2.amen.fr. 4 A 81.88.63.39
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0