Apex domains cannot have CNAME records.
Question and response
Question
dig laspalmas.edu.do. NS
Answer
laspalmas.edu.do. 5 NS ns6095.hostgator.com.
laspalmas.edu.do. 5 NS ns6096.hostgator.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0