Apex domains cannot have CNAME records.
Question and response
Question
dig inden.edu.do. NS
Answer
inden.edu.do. 5 NS ns200.meritdesignshost.net.
inden.edu.do. 5 NS ns2.meritdns.com.
inden.edu.do. 5 NS ns1.meritdns.com.
inden.edu.do. 5 NS ns201.meritdesignshost.net.
Authority
The response has no authority records.
Additional
ns1.meritdns.com. 5 A 167.114.158.9
ns2.meritdns.com. 5 A 167.114.158.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0