Apex domains cannot have CNAME records.
Question and response
Question
dig pemontessori.edu.do. NS
Answer
pemontessori.edu.do. 4 NS ns3.dnetnoc.net.
pemontessori.edu.do. 4 NS ns4.dnetnoc.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0