Apex domains cannot have CNAME records.
Question and response
Question
dig secapp.fi. NS
Answer
secapp.fi. 5 NS ns1.secapp.fi.
secapp.fi. 5 NS ns3.secapp.fi.
secapp.fi. 5 NS ns2.secapp.fi.
Authority
The response has no authority records.
Additional
ns1.secapp.fi. 5 A 94.237.30.220
ns2.secapp.fi. 5 A 94.237.46.22
ns3.secapp.fi. 5 A 94.237.113.248
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0