Apex domains cannot have CNAME records.
Question and response
Question
dig itcaprende.edu.do. NS
Answer
itcaprende.edu.do. 1 NS ns1.itcaprende.edu.do.
itcaprende.edu.do. 1 NS ns2.itcaprende.edu.do.
Authority
The response has no authority records.
Additional
ns1.itcaprende.edu.do. 1 A 54.39.202.109
ns2.itcaprende.edu.do. 1 A 54.39.202.109
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0