Apex domains cannot have CNAME records.
Question and response
Question
dig sicoes.gob.bo. NS
Answer
sicoes.gob.bo. 5 NS ns1.sicoes.gob.bo.
sicoes.gob.bo. 5 NS ns2.sicoes.gob.bo.
sicoes.gob.bo. 5 NS ns3.sicoes.gob.bo.
Authority
The response has no authority records.
Additional
ns1.sicoes.gob.bo. 5 A 190.181.50.198
ns2.sicoes.gob.bo. 5 A 190.14.104.12
ns3.sicoes.gob.bo. 5 A 186.121.222.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0