Apex domains cannot have CNAME records.
Question and response
Question
dig bancofortaleza.com.bo. NS
Answer
bancofortaleza.com.bo. 5 NS ns.bancofortaleza.com.bo.
bancofortaleza.com.bo. 5 NS ns2.bancofortaleza.com.bo.
Authority
The response has no authority records.
Additional
ns.bancofortaleza.com.bo. 5 A 200.87.97.120
ns2.bancofortaleza.com.bo. 5 A 186.121.208.19
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0