Apex domains cannot have CNAME records.
Question and response
Question
dig apetstore.net. NS
Answer
apetstore.net. 5 NS ns-601.awsdns-11.net.
apetstore.net. 5 NS ns-774.awsdns-32.net.
apetstore.net. 5 NS ns-1746.awsdns-26.co.uk.
apetstore.net. 5 NS ns-322.awsdns-40.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0