Apex domains cannot have CNAME records.
Question and response
Question
dig ba.net. NS
Answer
ba.net. 4 NS dns2.brujula.net.
ba.net. 4 NS dns4.brujula.net.
ba.net. 4 NS dns.brujula.net.
ba.net. 4 NS dns1.globalgate.com.ar.
Authority
The response has no authority records.
Additional
dns.brujula.net. 4 A 104.236.158.117
dns1.globalgate.com.ar. 4 A 200.0.185.100
dns2.brujula.net. 4 A 104.131.74.119
dns4.brujula.net. 4 A 104.236.64.166
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0