Apex domains cannot have CNAME records.
Question and response
Question
dig pizza. NS
Answer
pizza. 5 NS v0n0.nic.pizza.
pizza. 5 NS v2n0.nic.pizza.
pizza. 5 NS v0n2.nic.pizza.
pizza. 5 NS v0n3.nic.pizza.
pizza. 5 NS v0n1.nic.pizza.
pizza. 5 NS v2n1.nic.pizza.
Authority
The response has no authority records.
Additional
v0n0.nic.pizza. 93012 A 65.22.28.50
v0n1.nic.pizza. 93012 A 65.22.29.50
v0n2.nic.pizza. 93012 A 65.22.30.50
v0n3.nic.pizza. 93012 A 161.232.14.50
v2n0.nic.pizza. 93012 A 65.22.31.50
v2n1.nic.pizza. 93012 A 161.232.15.50
v0n0.nic.pizza. 93012 AAAA 2a01:8840:1e:0:0:0:0:50
v0n1.nic.pizza. 93012 AAAA 2a01:8840:1f:0:0:0:0:50
v0n2.nic.pizza. 93012 AAAA 2a01:8840:20:0:0:0:0:50
v0n3.nic.pizza. 93012 AAAA 2a01:8840:f8:0:0:0:0:50
v2n0.nic.pizza. 93012 AAAA 2a01:8840:21:0:0:0:0:50
v2n1.nic.pizza. 93012 AAAA 2a01:8840:f9:0:0:0:0:50
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0