Apex domains cannot have CNAME records.
Question and response
Question
dig zafdns.com. NS
Answer
zafdns.com. 4 NS ns2.zafdns.com.
zafdns.com. 4 NS ns3.zafdns.ca.
zafdns.com. 4 NS ns1.zafdns.ca.
Authority
The response has no authority records.
Additional
ns1.zafdns.ca. 4 A 208.79.216.62
ns2.zafdns.com. 5 A 172.236.103.225
ns3.zafdns.ca. 4 A 172.232.181.247
ns1.zafdns.ca. 4 AAAA 2605:6f00:1234:207:1:0:0:19c
ns2.zafdns.com. 5 AAAA 2600:3c06:0:0:f03c:95ff:fe39:ddb0
ns3.zafdns.ca. 4 AAAA 2600:3c0a:0:0:f03c:95ff:fecd:4593
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0