Apex domains cannot have CNAME records.
Question and response
Question
dig pf. NS
Answer
pf. 5 NS ns1.mana.pf.
pf. 5 NS ns2.mana.pf.
pf. 5 NS ns03.pf.
Authority
The response has no authority records.
Additional
ns1.mana.pf. 172603 A 202.3.225.10
ns2.mana.pf. 172603 A 202.3.225.20
ns03.pf. 171040 A 103.254.227.99
ns03.pf. 171040 AAAA 2402:6d00:1000:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0