Apex domains cannot have CNAME records.
Question and response
Question
dig kz. NS
Answer
kz. 5 NS ns1.nic.kz.
kz. 5 NS ns.nic.kz.
kz. 5 NS ns2.nic.kz.
Authority
The response has no authority records.
Additional
ns.nic.kz. 167044 A 194.0.21.5
ns1.nic.kz. 169863 A 185.79.212.7
ns2.nic.kz. 162035 A 204.61.216.143
ns.nic.kz. 167044 AAAA 2001:678:98:1:0:0:0:5
ns1.nic.kz. 169863 AAAA 2a01:7640:9000:0:0:0:0:7
ns2.nic.kz. 162035 AAAA 2001:500:14:6143:ad:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0