Apex domains cannot have CNAME records.
Question and response
Question
dig bedrijfswagengroep.nl. NS
Answer
bedrijfswagengroep.nl. 5 NS ns02.hostnet.nl.
bedrijfswagengroep.nl. 5 NS ns01.hostnet.nl.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0