Apex domains cannot have CNAME records.
Question and response
Question
dig au-i.org. NS
Answer
au-i.org. 5 NS ns-318.awsdns-39.com.
au-i.org. 5 NS ns-605.awsdns-11.net.
au-i.org. 5 NS ns-77.awsdns-09.com.
au-i.org. 5 NS ns-179.awsdns-22.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0