Apex domains cannot have CNAME records.
Question and response
Question
dig cbcconst.com. NS
Answer
cbcconst.com. 5 NS ns1.cbcconst.com.
cbcconst.com. 5 NS ns2.cbcconst.com.
Authority
The response has no authority records.
Additional
ns1.cbcconst.com. 5 A 139.99.68.185
ns2.cbcconst.com. 5 A 51.79.234.118
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0