Apex domains cannot have CNAME records.
Question and response
Question
dig nic.fm. NS
Answer
nic.fm. 5 NS a.nic.fm.
nic.fm. 5 NS b.nic.fm.
nic.fm. 5 NS c.nic.fm.
nic.fm. 5 NS d.nic.fm.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0