Apex domains cannot have CNAME records.
Question and response
Question
dig dc-fl.com. NS
Answer
dc-fl.com. 3 NS dns1.bcbsfl.com.
dc-fl.com. 3 NS dns2.bcbsfl.com.
Authority
The response has no authority records.
Additional
dns1.bcbsfl.com. 3 A 157.174.228.211
dns2.bcbsfl.com. 3 A 157.174.228.212
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0