Apex domains cannot have CNAME records.
Question and response
Question
dig tv. NS
Answer
tv. 5 NS c.nic.tv.
tv. 5 NS a.nic.tv.
tv. 5 NS b.nic.tv.
tv. 5 NS z.nic.tv.
tv. 5 NS y.nic.tv.
tv. 5 NS x.nic.tv.
Authority
The response has no authority records.
Additional
a.nic.tv. 154944 A 37.209.192.6
b.nic.tv. 154944 A 37.209.194.6
c.nic.tv. 154944 A 37.209.196.6
x.nic.tv. 80964 A 156.154.103.22
y.nic.tv. 80964 A 156.154.104.22
z.nic.tv. 80964 A 156.154.105.22
a.nic.tv. 154944 AAAA 2001:dcd:1:0:0:0:0:6
b.nic.tv. 154944 AAAA 2001:dcd:2:0:0:0:0:6
c.nic.tv. 154944 AAAA 2001:dcd:3:0:0:0:0:6
x.nic.tv. 80964 AAAA 2610:a1:1010:0:0:0:0:22
y.nic.tv. 80964 AAAA 2610:a1:1011:0:0:0:0:22
z.nic.tv. 80964 AAAA 2610:a1:1012:0:0:0:0:22
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0