Apex domains cannot have CNAME records.
Question and response
Question
dig solutions.fi. NS
Answer
solutions.fi. 5 NS dns1.solutions.fi.
solutions.fi. 5 NS dns2.solutions.fi.
solutions.fi. 5 NS dns3.solutions.fi.
Authority
The response has no authority records.
Additional
dns1.solutions.fi. 5 A 217.112.192.2
dns2.solutions.fi. 5 A 185.193.77.1
dns3.solutions.fi. 5 A 194.197.177.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0