Apex domains cannot have CNAME records.
Question and response
Question
dig 4into3.com.au. NS
Answer
4into3.com.au. 5 NS kehlani.ns.cloudflare.com.
4into3.com.au. 5 NS kyrie.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0