Apex domains cannot have CNAME records.
Question and response
Question
dig authorize.net. NS
Answer
authorize.net. 1 NS melinda.ns.cloudflare.com.
authorize.net. 1 NS a9-64.akam.net.
authorize.net. 1 NS a1-190.akam.net.
authorize.net. 1 NS a2-65.akam.net.
authorize.net. 1 NS lloyd.ns.cloudflare.com.
authorize.net. 1 NS a10-64.akam.net.
Authority
The response has no authority records.
Additional
lloyd.ns.cloudflare.com. 1 A 108.162.193.197
lloyd.ns.cloudflare.com. 1 A 172.64.33.197
lloyd.ns.cloudflare.com. 1 A 173.245.59.197
melinda.ns.cloudflare.com. 1 A 108.162.192.198
melinda.ns.cloudflare.com. 1 A 172.64.32.198
melinda.ns.cloudflare.com. 1 A 173.245.58.198
lloyd.ns.cloudflare.com. 1 AAAA 2606:4700:58:0:0:0:adf5:3bc5
lloyd.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c1c5
lloyd.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:21c5
melinda.ns.cloudflare.com. 1 AAAA 2606:4700:50:0:0:0:adf5:3ac6
melinda.ns.cloudflare.com. 1 AAAA 2803:f800:50:0:0:0:6ca2:c0c6
melinda.ns.cloudflare.com. 1 AAAA 2a06:98c1:50:0:0:0:ac40:20c6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0