Apex domains cannot have CNAME records.
Question and response
Question
dig lactld.org. NS
Answer
lactld.org. 5 NS a.lactld.org.
lactld.org. 5 NS ssdns-tld.nic.cl.
lactld.org. 5 NS ns.dns.br.
Authority
The response has no authority records.
Additional
a.lactld.org. 5 A 200.0.68.10
a.lactld.org. 5 AAAA 2801:14:a000:0:0:0:0:10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0