Apex domains cannot have CNAME records.
Question and response
Question
dig hostex.lt. NS
Answer
hostex.lt. 4 NS ns1.data.lt.
hostex.lt. 4 NS ns2.data.lt.
Authority
The response has no authority records.
Additional
ns1.data.lt. 4 A 88.118.184.50
ns2.data.lt. 4 A 88.118.184.54
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0