Apex domains cannot have CNAME records.
Question and response
Question
dig learningstepsrd.edu.do. NS
Answer
learningstepsrd.edu.do. 5 NS da700a.trouble-free.net.
learningstepsrd.edu.do. 5 NS da700b.trouble-free.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0