Apex domains cannot have CNAME records.
Question and response
Question
dig caacohio.org. NS
Answer
caacohio.org. 4 NS ns-147.awsdns-18.com.
caacohio.org. 4 NS ns-1937.awsdns-50.co.uk.
caacohio.org. 4 NS ns-1792.awsdns-32.co.uk.
caacohio.org. 4 NS ns-272.awsdns-34.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0