Apex domains cannot have CNAME records.
Question and response
Question
dig nic.tv. NS
Answer
nic.tv. 5 NS b.nic.tv.
nic.tv. 5 NS c.nic.tv.
nic.tv. 5 NS d.nic.tv.
nic.tv. 5 NS a.nic.tv.
Authority
The response has no authority records.
Additional
a.nic.tv. 5 A 37.209.192.6
b.nic.tv. 5 A 37.209.194.6
c.nic.tv. 5 A 37.209.196.6
d.nic.tv. 5 A 37.209.198.6
a.nic.tv. 5 AAAA 2001:dcd:1:0:0:0:0:6
b.nic.tv. 5 AAAA 2001:dcd:2:0:0:0:0:6
c.nic.tv. 5 AAAA 2001:dcd:3:0:0:0:0:6
d.nic.tv. 5 AAAA 2001:dcd:4:0:0:0:0:6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0