Apex domains cannot have CNAME records.
Question and response
Question
dig zebra.lt. NS
Answer
zebra.lt. 5 NS ns3.teliahosting.lt.
zebra.lt. 5 NS ns2.teliahosting.lt.
zebra.lt. 5 NS ns1.teliahosting.lt.
zebra.lt. 5 NS ns4.teliahosting.lt.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0