Apex domains cannot have CNAME records.
Question and response
Question
dig archerirm.com.au. NS
Answer
archerirm.com.au. 5 NS ns-747.awsdns-29.net.
archerirm.com.au. 5 NS ns-1443.awsdns-52.org.
archerirm.com.au. 5 NS ns-1787.awsdns-31.co.uk.
archerirm.com.au. 5 NS ns-152.awsdns-19.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0