Apex domains cannot have CNAME records.
Question and response
Question
dig southdata.com. NS
Answer
southdata.com. 5 NS dns4.p01.nsone.net.
southdata.com. 5 NS dns3.p01.nsone.net.
southdata.com. 5 NS ns1.d-zone.ca.
southdata.com. 5 NS dns1.p01.nsone.net.
southdata.com. 5 NS dns2.p01.nsone.net.
southdata.com. 5 NS ns2.d-zone.ca.
Authority
The response has no authority records.
Additional
ns1.d-zone.ca. 5 A 162.219.54.2
ns2.d-zone.ca. 5 A 162.219.55.2
dns1.p01.nsone.net. 1 A 198.51.44.1
dns2.p01.nsone.net. 1 A 198.51.45.1
dns3.p01.nsone.net. 1 A 198.51.44.65
dns4.p01.nsone.net. 1 A 198.51.45.65
ns1.d-zone.ca. 5 AAAA 2620:10a:80eb:0:0:0:0:2
ns2.d-zone.ca. 5 AAAA 2620:10a:80ec:0:0:0:0:2
dns1.p01.nsone.net. 1 AAAA 2620:4d:4000:6259:7:1:0:1
dns2.p01.nsone.net. 1 AAAA 2a00:edc0:6259:7:1:0:0:2
dns3.p01.nsone.net. 1 AAAA 2620:4d:4000:6259:7:1:0:3
dns4.p01.nsone.net. 1 AAAA 2a00:edc0:6259:7:1:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0