Apex domains cannot have CNAME records.
Question and response
Question
dig llc. NS
Answer
llc. 5 NS a2.nic.llc.
llc. 5 NS a0.nic.llc.
llc. 5 NS c0.nic.llc.
llc. 5 NS b0.nic.llc.
Authority
The response has no authority records.
Additional
a0.nic.llc. 172156 A 65.22.36.9
a2.nic.llc. 154656 A 65.22.39.9
b0.nic.llc. 172156 A 65.22.37.9
c0.nic.llc. 172156 A 65.22.38.9
a0.nic.llc. 172156 AAAA 2a01:8840:26:0:0:0:0:9
a2.nic.llc. 154656 AAAA 2a01:8840:29:0:0:0:0:9
b0.nic.llc. 172156 AAAA 2a01:8840:27:0:0:0:0:9
c0.nic.llc. 172156 AAAA 2a01:8840:28:0:0:0:0:9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0