Apex domains cannot have CNAME records.
Question and response
Question
dig brainpink.nl. NS
Answer
brainpink.nl. 5 NS kia.ns.cloudflare.com.
brainpink.nl. 5 NS sean.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0