Apex domains cannot have CNAME records.
Question and response
Question
dig bankinfo.com. NS
Answer
bankinfo.com. 5 NS ns102.bankinfo.com.
bankinfo.com. 5 NS ns105.bankinfo.com.
bankinfo.com. 5 NS ns106.bankinfo.com.
bankinfo.com. 5 NS ns101.bankinfo.com.
bankinfo.com. 5 NS ns103.bankinfo.com.
bankinfo.com. 5 NS ns104.bankinfo.com.
Authority
The response has no authority records.
Additional
ns101.bankinfo.com. 5 A 199.212.219.19
ns102.bankinfo.com. 5 A 199.212.219.20
ns103.bankinfo.com. 5 A 66.241.52.133
ns104.bankinfo.com. 5 A 66.241.52.134
ns105.bankinfo.com. 5 A 216.19.108.133
ns106.bankinfo.com. 5 A 216.19.108.134
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0