Apex domains cannot have CNAME records.
Question and response
Question
dig sky.extrahosting.ro. NS
Answer
sky.extrahosting.ro. 5 NS ns1.bensoft.ro.
sky.extrahosting.ro. 5 NS ns2.bensoft.ro.
Authority
The response has no authority records.
Additional
ns2.bensoft.ro. 5 A 195.49.249.196
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0