Apex domains cannot have CNAME records.
Question and response
Question
dig enfo.fi. NS
Answer
enfo.fi. 5 NS ns3.enfo.fi.
enfo.fi. 5 NS ns1.enfo.fi.
enfo.fi. 5 NS ns4.enfo.fi.
enfo.fi. 5 NS ns5.enfogroup.com.
enfo.fi. 5 NS ns2.enfo.fi.
Authority
The response has no authority records.
Additional
ns1.enfo.fi. 5 A 77.95.147.132
ns2.enfo.fi. 5 A 77.95.147.133
ns3.enfo.fi. 5 A 217.69.50.132
ns4.enfo.fi. 5 A 217.69.50.133
ns5.enfogroup.com. 5 A 52.209.122.190
ns5.enfogroup.com. 5 AAAA 2a05:d018:d4b:f900:948d:de9d:e26f:9775
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0