Apex domains cannot have CNAME records.
Question and response
Question
dig busyauction.com. NS
Answer
busyauction.com. 5 NS ns-1904.awsdns-46.co.uk.
busyauction.com. 5 NS ns-1238.awsdns-26.org.
busyauction.com. 5 NS ns-367.awsdns-45.com.
busyauction.com. 5 NS ns-678.awsdns-20.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0