Apex domains cannot have CNAME records.
Question and response
Question
dig exhgost.com. NS
Answer
exhgost.com. 4 NS dns2.registrar-servers.com.
exhgost.com. 4 NS dns1.registrar-servers.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0