Apex domains cannot have CNAME records.
Question and response
Question
dig fj. NS
Answer
fj. 5 NS ns3.fj.
fj. 5 NS ns4.fj.
fj. 5 NS ns1.fj.
fj. 5 NS ns2.fj.
fj. 5 NS ns5.fj.
Authority
The response has no authority records.
Additional
ns1.fj. 165803 A 144.120.146.1
ns2.fj. 145461 A 144.120.146.65
ns3.fj. 4491 A 185.38.108.108
ns4.fj. 4491 A 185.28.194.194
ns5.fj. 4491 A 204.61.216.138
ns1.fj. 165803 AAAA 2402:2940:100:100c:0:0:0:1
ns2.fj. 145461 AAAA 2402:2940:100:100d:0:0:0:1
ns5.fj. 4491 AAAA 2001:500:14:6138:ad:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0