Apex domains cannot have CNAME records.
Question and response
Question
dig eastlink.ca. NS
Answer
eastlink.ca. 5 NS ns2.d-zone.ca.
eastlink.ca. 5 NS ns1.d-zone.ca.
Authority
The response has no authority records.
Additional
ns1.d-zone.ca. 3 A 162.219.54.2
ns2.d-zone.ca. 3 A 162.219.55.2
ns1.d-zone.ca. 3 AAAA 2620:10a:80eb:0:0:0:0:2
ns2.d-zone.ca. 3 AAAA 2620:10a:80ec:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0