Apex domains cannot have CNAME records.
Question and response
Question
dig intelsolutions.gr. NS
Answer
intelsolutions.gr. 5 NS dns2.papaki.gr.
intelsolutions.gr. 5 NS dns1.papaki.gr.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0