Apex domains cannot have CNAME records.
Question and response
Question
dig brainergy.digital. NS
Answer
brainergy.digital. 3 NS ns.beenets.com.
brainergy.digital. 3 NS ns2.beenets.com.
Authority
The response has no authority records.
Additional
ns.beenets.com. 3 A 117.121.210.10
ns2.beenets.com. 3 A 117.121.222.20
ns.beenets.com. 3 AAAA 2400:cd00:4:5:0:0:0:6
ns2.beenets.com. 3 AAAA 2400:cd00:2:1:0:0:0:20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0