Apex domains cannot have CNAME records.
Question and response
Question
dig backgronds.com. NS
Answer
backgronds.com. 2 NS ns2.bviabc.com.
backgronds.com. 2 NS ns1.bviabc.com.
Authority
The response has no authority records.
Additional
ns1.bviabc.com. 2 A 46.228.205.160
ns2.bviabc.com. 2 A 46.228.205.160
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0