Apex domains cannot have CNAME records.
Question and response
Question
dig oxygencomputers.ro. NS
Answer
oxygencomputers.ro. 4 NS neptun.o2it.ro.
Authority
The response has no authority records.
Additional
neptun.o2it.ro. 4 A 185.99.89.26
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0