Apex domains cannot have CNAME records.
Question and response
Question
dig verointernet.com.br. NS
Answer
verointernet.com.br. 5 NS ns-1532.awsdns-63.org.
verointernet.com.br. 5 NS ns-781.awsdns-33.net.
verointernet.com.br. 5 NS ns-285.awsdns-35.com.
verointernet.com.br. 5 NS ns-2045.awsdns-63.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0