Apex domains cannot have CNAME records.
Question and response
Question
dig hornbill.com. NS
Answer
hornbill.com. 5 NS carl.ns.cloudflare.com.
hornbill.com. 5 NS cheryl.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
cheryl.ns.cloudflare.com. 3 A 108.162.192.83
cheryl.ns.cloudflare.com. 3 A 172.64.32.83
cheryl.ns.cloudflare.com. 3 A 173.245.58.83
cheryl.ns.cloudflare.com. 3 AAAA 2606:4700:50:0:0:0:adf5:3a53
cheryl.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c053
cheryl.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:2053
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0