Apex domains cannot have CNAME records.
Question and response
Question
dig bhc-co.com. NS
Answer
bhc-co.com. 5 NS ns-242.awsdns-30.com.
bhc-co.com. 5 NS ns-1121.awsdns-12.org.
bhc-co.com. 5 NS ns-1864.awsdns-41.co.uk.
bhc-co.com. 5 NS ns-214.awsdns-26.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0