Apex domains cannot have CNAME records.
Question and response
Question
dig claus.ro. NS
Answer
claus.ro. 5 NS ns.romania-webhosting.com.
claus.ro. 5 NS ns.registar.ro.
claus.ro. 5 NS ns.claus.ro.
claus.ro. 5 NS ns.clausweb.ro.
Authority
The response has no authority records.
Additional
ns.claus.ro. 5 A 86.107.43.2
ns.clausweb.ro. 5 A 46.4.29.149
ns.registar.ro. 5 A 85.204.69.1
ns.romania-webhosting.com. 5 A 85.9.19.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0