Apex domains cannot have CNAME records.
Question and response
Question
dig muug.ca. NS
Answer
muug.ca. 5 NS dns3.easydns.org.
muug.ca. 5 NS dns2.easydns.net.
muug.ca. 5 NS dns1.easydns.com.
Authority
The response has no authority records.
Additional
dns1.easydns.com. 5 A 64.68.196.10
dns2.easydns.net. 5 A 64.68.193.10
dns3.easydns.org. 5 A 64.68.192.10
dns1.easydns.com. 5 AAAA 2620:49:3:0:0:0:0:10
dns2.easydns.net. 5 AAAA 2620:49:2:0:0:0:0:10
dns3.easydns.org. 5 AAAA 2620:49:1:0:0:0:0:10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0