Apex domains cannot have CNAME records.
Question and response
Question
dig quaventra.org. NS
Answer
quaventra.org. 5 NS ns-448.awsdns-56.com.
quaventra.org. 5 NS ns-1166.awsdns-17.org.
quaventra.org. 5 NS ns-844.awsdns-41.net.
quaventra.org. 5 NS ns-753.awsdns-30.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0