Apex domains cannot have CNAME records.
Question and response
Question
dig lv. NS
Answer
lv. 5 NS nu.nic.lv.
lv. 5 NS b.nic.lv.
lv. 5 NS n.nic.lv.
lv. 5 NS a.nic.lv.
lv. 5 NS c.nic.lv.
lv. 5 NS d.nic.lv.
lv. 5 NS sunic.sunet.se.
Authority
The response has no authority records.
Additional
a.nic.lv. 70537 A 194.0.48.1
b.nic.lv. 20605 A 92.240.70.1
c.nic.lv. 48440 A 185.159.199.140
d.nic.lv. 34078 A 194.0.8.1
n.nic.lv. 43646 A 194.146.106.150
nu.nic.lv. 61537 A 77.72.229.249
sunic.sunet.se. 5 A 192.36.125.2
a.nic.lv. 70537 AAAA 2001:678:7c:0:0:0:0:7c
c.nic.lv. 48440 AAAA 2620:10a:80ac:0:0:0:0:140
d.nic.lv. 34078 AAAA 2001:678:b:1:0:0:0:1
n.nic.lv. 43646 AAAA 2001:67c:1010:38:0:0:0:53
nu.nic.lv. 61537 AAAA 2a01:3f0:0:312:0:0:0:53
sunic.sunet.se. 5 AAAA 2001:6b0:7:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0