Apex domains cannot have CNAME records.
Question and response
Question
dig idec.edu.do. NS
Answer
idec.edu.do. 5 NS ns-1717.awsdns-22.co.uk.
idec.edu.do. 5 NS ns-156.awsdns-19.com.
idec.edu.do. 5 NS ns-568.awsdns-07.net.
idec.edu.do. 5 NS ns-1040.awsdns-02.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0