Apex domains cannot have CNAME records.
Question and response
Question
dig itassist.ro. NS
Answer
itassist.ro. 1 NS ns1.itassist.ro.
itassist.ro. 1 NS ns3.itassist.ro.
itassist.ro. 1 NS ns2.itassist.ro.
itassist.ro. 1 NS ns4.itassist.ro.
Authority
The response has no authority records.
Additional
ns1.itassist.ro. 1 A 52.183.100.230
ns2.itassist.ro. 1 A 91.237.248.2
ns3.itassist.ro. 1 A 52.166.72.38
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0