Apex domains cannot have CNAME records.
Question and response
Question
dig ahead.ro. NS
Answer
ahead.ro. 5 NS mercur.o2it.ro.
ahead.ro. 5 NS neptun.o2it.ro.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0