Apex domains cannot have CNAME records.
Question and response
Question
dig ec. NS
Answer
ec. 5 NS n2.nic.ec.
ec. 5 NS ns2.anycastdns.cz.
ec. 5 NS a.lactld.org.
ec. 5 NS n3.dns.ec.
ec. 5 NS ns1.anycastdns.cz.
Authority
The response has no authority records.
Additional
a.lactld.org. 5 A 200.0.68.10
n2.nic.ec. 167283 A 200.12.199.1
n3.dns.ec. 170142 A 204.61.216.39
ns1.anycastdns.cz. 5 A 185.38.108.108
ns2.anycastdns.cz. 5 A 185.28.194.194
a.lactld.org. 5 AAAA 2801:14:a000:0:0:0:0:10
n2.nic.ec. 167283 AAAA 2801:0:60:0:0:0:0:1
n3.dns.ec. 170142 AAAA 2001:500:14:6039:ad:0:0:1
ns1.anycastdns.cz. 5 AAAA 2a00:fea0:dead:0:0:0:0:beef
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0