Apex domains cannot have CNAME records.
Question and response
Question
dig blink.ca. NS
Answer
blink.ca. 5 NS ns2.blink.ca.
blink.ca. 5 NS ns1.blink.ca.
Authority
The response has no authority records.
Additional
ns1.blink.ca. 5 A 209.148.132.165
ns2.blink.ca. 5 A 209.148.128.212
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0