Apex domains cannot have CNAME records.
Question and response
Question
dig pgarc.org. NS
Answer
pgarc.org. 5 NS ns-670.awsdns-19.net.
pgarc.org. 5 NS ns-1604.awsdns-08.co.uk.
pgarc.org. 5 NS ns-1635.awsdns-12.co.uk.
pgarc.org. 5 NS ns-21.awsdns-02.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0