Apex domains cannot have CNAME records.
Question and response
Question
dig fitx.ro. NS
Answer
fitx.ro. 5 NS ns1.fitx.ro.
fitx.ro. 5 NS ns2.fitx.ro.
Authority
The response has no authority records.
Additional
ns1.fitx.ro. 5 A 92.81.122.243
ns2.fitx.ro. 5 A 51.195.43.81
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0