Apex domains cannot have CNAME records.
Question and response
Question
dig cl. NS
Answer
cl. 5 NS b.nic.cl.
cl. 5 NS cl2-tld.d-zone.ca.
cl. 5 NS a.nic.cl.
cl. 5 NS cl-ns.anycast.pch.net.
cl. 5 NS c.nic.cl.
cl. 5 NS cl1.dnsnode.net.
cl. 5 NS cl1-tld.d-zone.ca.
Authority
The response has no authority records.
Additional
a.nic.cl. 172788 A 190.124.27.10
b.nic.cl. 172788 A 200.7.4.7
c.nic.cl. 172788 A 200.16.112.16
a.nic.cl. 172788 AAAA 2001:1398:121:0:190:124:27:10
b.nic.cl. 172788 AAAA 2001:1398:274:0:200:7:4:7
c.nic.cl. 172788 AAAA 2001:1398:275:0:200:16:112:16
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0