Apex domains cannot have CNAME records.
Question and response
Question
dig bms.com. NS
Answer
bms.com. 3 NS ns1.bms.com.
bms.com. 3 NS ns4.bms.com.
bms.com. 3 NS ns3.bms.com.
bms.com. 3 NS ns2.bms.com.
Authority
The response has no authority records.
Additional
ns1.bms.com. 3 A 198.155.167.250
ns2.bms.com. 3 A 198.155.167.248
ns3.bms.com. 3 A 198.155.223.8
ns4.bms.com. 3 A 158.117.22.129
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0