Apex domains cannot have CNAME records.
Question and response
Question
dig afschool.edu.do. NS
Answer
afschool.edu.do. 4 NS ns6078.hostgator.com.
afschool.edu.do. 4 NS ns6077.hostgator.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0