Apex domains cannot have CNAME records.
Question and response
Question
dig liveinternet.com.br. NS
Answer
liveinternet.com.br. 5 NS ns1.liveinternet.com.br.
liveinternet.com.br. 5 NS ns2.liveinternet.com.br.
Authority
The response has no authority records.
Additional
ns1.liveinternet.com.br. 5 A 45.235.44.34
ns2.liveinternet.com.br. 5 A 45.235.44.36
ns1.liveinternet.com.br. 5 AAAA 2804:4d80:8000:b:45:235:44:34
ns2.liveinternet.com.br. 5 AAAA 2804:4d80:8000:b:45:235:44:36
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0