Apex domains cannot have CNAME records.
Question and response
Question
dig comodogroup.com. NS
Answer
comodogroup.com. 5 NS ns3.netim.net.
comodogroup.com. 5 NS ns1.netim.net.
comodogroup.com. 5 NS ns2.netim.net.
Authority
The response has no authority records.
Additional
ns2.netim.net. 5 A 192.174.68.97
ns3.netim.net. 5 A 176.97.158.97
ns2.netim.net. 5 AAAA 2001:67c:1bc:0:0:0:0:97
ns3.netim.net. 5 AAAA 2001:67c:10b8:0:0:0:0:97
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0