Apex domains cannot have CNAME records.
Question and response
Question
dig csodfed.com. NS
Answer
csodfed.com. 5 NS ns-1930.awsdns-49.co.uk.
csodfed.com. 5 NS ns-1353.awsdns-41.org.
csodfed.com. 5 NS ns-12.awsdns-01.com.
csodfed.com. 5 NS ns-610.awsdns-12.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0