Apex domains cannot have CNAME records.
Question and response
Question
dig intervencionkf.edu.do. NS
Answer
intervencionkf.edu.do. 5 NS ns04.domaincontrol.com.
intervencionkf.edu.do. 5 NS ns03.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0