Apex domains cannot have CNAME records.
Question and response
Question
dig sencia.ca. NS
Answer
sencia.ca. 3 NS ns2.s7host.net.
sencia.ca. 3 NS ns4.s7host.net.
sencia.ca. 3 NS ns1.s7host.net.
sencia.ca. 3 NS ns3.s7host.net.
Authority
The response has no authority records.
Additional
ns1.s7host.net. 3 A 216.211.21.226
ns2.s7host.net. 3 A 184.68.71.238
ns3.s7host.net. 3 A 169.55.169.61
ns4.s7host.net. 3 A 169.54.67.4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0