Apex domains cannot have CNAME records.
Question and response
Question
dig veeva.com. NS
Answer
veeva.com. 4 NS ns-402.awsdns-50.com.
veeva.com. 4 NS ns-1811.awsdns-34.co.uk.
veeva.com. 4 NS ns-1114.awsdns-11.org.
veeva.com. 4 NS ns-717.awsdns-25.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0