Apex domains cannot have CNAME records.
Question and response
Question
dig cch.com.au. NS
Answer
cch.com.au. 5 NS edns9.ultradns.biz.
cch.com.au. 5 NS edns9.ultradns.org.
cch.com.au. 5 NS edns9.ultradns.net.
cch.com.au. 5 NS edns9.ultradns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0