Apex domains cannot have CNAME records.
Question and response
Question
dig versio.nl. NS
Answer
versio.nl. 5 NS ns1.cldin.eu.
versio.nl. 5 NS ns3.cldin.eu.
versio.nl. 5 NS ns2.cldin.eu.
Authority
The response has no authority records.
Additional
ns1.cldin.eu. 5 A 92.63.172.150
ns2.cldin.eu. 5 A 185.107.214.229
ns3.cldin.eu. 5 A 195.8.208.2
ns1.cldin.eu. 5 AAAA 2a05:1500:600:9:1c00:26ff:fe00:1618
ns2.cldin.eu. 5 AAAA 2a05:1500:601:3:5054:ff:fe0d:9fa7
ns3.cldin.eu. 5 AAAA 2a05:1500:fe00:0:0:c3ff:fe08:d002
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0