Apex domains cannot have CNAME records.
Question and response
Question
dig psi.ca. NS
Answer
psi.ca. 4 NS pri2.dns.ca.telus.com.
psi.ca. 4 NS pri1.dns.ca.telus.com.
psi.ca. 4 NS pri4.dns.ca.telus.com.
psi.ca. 4 NS pri3.dns.ca.telus.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0