Apex domains cannot have CNAME records.
Question and response
Question
dig cuasir.edu.do. NS
Answer
cuasir.edu.do. 5 NS ns2.cuasir.edu.do.
cuasir.edu.do. 5 NS ns1.cuasir.edu.do.
Authority
The response has no authority records.
Additional
ns1.cuasir.edu.do. 5 A 142.44.179.76
ns2.cuasir.edu.do. 5 A 142.44.179.76
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0