Apex domains cannot have CNAME records.
Question and response
Question
dig venture.com. NS
Answer
venture.com. 5 NS ns-621.awsdns-13.net.
venture.com. 5 NS ns-2019.awsdns-60.co.uk.
venture.com. 5 NS ns-385.awsdns-48.com.
venture.com. 5 NS ns-1058.awsdns-04.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0