Apex domains cannot have CNAME records.
Question and response
Question
dig adobe.ca. NS
Answer
adobe.ca. 5 NS a1-217.akam.net.
adobe.ca. 5 NS a13-65.akam.net.
adobe.ca. 5 NS a28-67.akam.net.
adobe.ca. 5 NS a26-66.akam.net.
adobe.ca. 5 NS a10-64.akam.net.
adobe.ca. 5 NS a7-64.akam.net.
Authority
The response has no authority records.
Additional
a28-67.akam.net. 4 A 95.100.173.67
a28-67.akam.net. 4 AAAA 2600:1480:d800:0:0:0:0:43
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0