Apex domains cannot have CNAME records.
Question and response
Question
dig pmsd.edu.do. NS
Answer
pmsd.edu.do. 5 NS ns4.wixdns.net.
pmsd.edu.do. 5 NS ns5.wixdns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0