Apex domains cannot have CNAME records.
Question and response
Question
dig lasabejitas.edu.do. NS
Answer
lasabejitas.edu.do. 5 NS ns2.lasabejitas.edu.do.
lasabejitas.edu.do. 5 NS ns1.lasabejitas.edu.do.
Authority
The response has no authority records.
Additional
ns1.lasabejitas.edu.do. 5 A 144.217.104.45
ns2.lasabejitas.edu.do. 5 A 144.217.104.45
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0