Apex domains cannot have CNAME records.
Question and response
Question
dig us.bank. NS
Answer
us.bank. 5 NS ns4.us.bank.
us.bank. 5 NS ns2.us.bank.
Authority
The response has no authority records.
Additional
ns2.us.bank. 5 A 170.135.176.55
ns4.us.bank. 5 A 170.135.96.75
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0