Apex domains cannot have CNAME records.
Question and response
Question
dig winplc.com. NS
Answer
winplc.com. 1 NS ns-338.awsdns-42.com.
winplc.com. 1 NS ns-1383.awsdns-44.org.
winplc.com. 1 NS ns-1008.awsdns-62.net.
winplc.com. 1 NS ns-1634.awsdns-12.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0