Apex domains cannot have CNAME records.
Question and response
Question
dig ter1000.com.br. NS
Answer
ter1000.com.br. 5 NS dns4.ter1000.com.br.
ter1000.com.br. 5 NS dns3.ter1000.com.br.
ter1000.com.br. 5 NS dns1.ter1000.com.br.
ter1000.com.br. 5 NS dns2.ter1000.com.br.
Authority
The response has no authority records.
Additional
dns1.ter1000.com.br. 5 A 189.38.95.2
dns2.ter1000.com.br. 5 A 189.38.95.3
dns3.ter1000.com.br. 5 A 177.12.162.2
dns4.ter1000.com.br. 5 A 177.12.162.3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0