Apex domains cannot have CNAME records.
Question and response
Question
dig provider.nl. NS
Answer
provider.nl. 5 NS be.ns.vip.nl.
provider.nl. 5 NS nl.ns.vip.nl.
provider.nl. 5 NS dns.resolver.domains.
Authority
The response has no authority records.
Additional
be.ns.vip.nl. 5 A 185.94.228.197
nl.ns.vip.nl. 5 A 92.63.173.176
be.ns.vip.nl. 5 AAAA 2a05:1500:501:1:1c00:a4ff:fe00:135
nl.ns.vip.nl. 5 AAAA 2a05:1500:702:3:1c00:5fff:fe00:14b9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0