Apex domains cannot have CNAME records.
Question and response
Question
dig studioavw.nl. NS
Answer
studioavw.nl. 5 NS ns003.auroradns.info.
studioavw.nl. 5 NS ns001.auroradns.eu.
studioavw.nl. 5 NS ns002.auroradns.nl.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0