Apex domains cannot have CNAME records.
Question and response
Question
dig t4tel.com. NS
Answer
t4tel.com. 4 NS corp1.division57.com.
t4tel.com. 4 NS corp2.division57.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0