Apex domains cannot have CNAME records.
Question and response
Question
dig dausam.com. NS
Answer
dausam.com. 1 NS ns-513.awsdns-00.net.
dausam.com. 1 NS ns-721.awsdns-26.net.
dausam.com. 1 NS ns-1092.awsdns-08.org.
dausam.com. 1 NS ns-1384.awsdns-45.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0