Apex domains cannot have CNAME records.
Question and response
Question
dig mana.pf. NS
Answer
mana.pf. 5 NS ns02.mana.pf.
mana.pf. 5 NS ns01.mana.pf.
mana.pf. 5 NS ns1.mana.pf.
mana.pf. 5 NS ns2.mana.pf.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0