Apex domains cannot have CNAME records.
Question and response
Question
dig minedu.gob.bo. NS
Answer
minedu.gob.bo. 5 NS ns2.minedu.gob.bo.
Authority
The response has no authority records.
Additional
ns2.minedu.gob.bo. 5 A 186.121.222.67
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0