Apex domains cannot have CNAME records.
Question and response
Question
dig southingtonschool.org. NS
Answer
southingtonschool.org. 5 NS ns1.southingtonschool.org.
southingtonschool.org. 5 NS ns2.southingtonschool.org.
Authority
The response has no authority records.
Additional
ns1.southingtonschool.org. 5 A 95.214.52.175
ns2.southingtonschool.org. 5 A 91.223.3.195
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0