Apex domains cannot have CNAME records.
Question and response
Question
dig rdcint.ca. NS
Answer
rdcint.ca. 5 NS dns1.datacentres.rogers.com.
rdcint.ca. 5 NS dns3.datacentres.rogers.com.
rdcint.ca. 5 NS dns2.datacentres.rogers.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0