Apex domains cannot have CNAME records.
Question and response
Question
dig terpolar.com. NS
Answer
terpolar.com. 5 NS ns1.controldeservidor.com.
terpolar.com. 5 NS ns3.controldeservidor.com.
terpolar.com. 5 NS ns2.controldeservidor.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0