Apex domains cannot have CNAME records.
Question and response
Question
dig cotas.com.bo. NS
Answer
cotas.com.bo. 4 NS dns1.cotas.com.bo.
cotas.com.bo. 4 NS dns2.cotas.com.bo.
Authority
The response has no authority records.
Additional
dns1.cotas.com.bo. 4 A 200.58.160.4
dns2.cotas.com.bo. 4 A 200.58.161.4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0