Apex domains cannot have CNAME records.
Question and response
Question
dig wightman.ca. NS
Answer
wightman.ca. 5 NS ns3.wightman.ca.
wightman.ca. 5 NS ns4.wightman.ca.
wightman.ca. 5 NS ns1.wightman.ca.
wightman.ca. 5 NS ns2.wightman.ca.
Authority
The response has no authority records.
Additional
ns1.wightman.ca. 5 A 68.69.147.36
ns2.wightman.ca. 5 A 68.69.147.37
ns3.wightman.ca. 5 A 68.69.147.38
ns4.wightman.ca. 5 A 68.69.147.39
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0