Apex domains cannot have CNAME records.
Question and response
Question
dig n3.com.au. NS
Answer
n3.com.au. 5 NS ns-368.awsdns-46.com.
n3.com.au. 5 NS ns-1251.awsdns-28.org.
n3.com.au. 5 NS ns-579.awsdns-08.net.
n3.com.au. 5 NS ns-1947.awsdns-51.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0