Apex domains cannot have CNAME records.
Question and response
Question
dig multianau.com. NS
Answer
multianau.com. 5 NS dns22.servidoresdns.net.
multianau.com. 5 NS dns21.servidoresdns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0