Apex domains cannot have CNAME records.
Question and response
Question
dig bridgerush.com. NS
Answer
bridgerush.com. 4 NS ns2.bridgerush.com.
bridgerush.com. 4 NS ns1.bridgerush.com.
Authority
The response has no authority records.
Additional
ns1.bridgerush.com. 4 A 64.235.39.49
ns2.bridgerush.com. 4 A 64.235.39.103
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0