Apex domains cannot have CNAME records.
Question and response
Question
dig adityabirla.com. NS
Answer
adityabirla.com. 5 NS ns-1114.awsdns-11.org.
adityabirla.com. 5 NS ns-116.awsdns-14.com.
adityabirla.com. 5 NS ns-970.awsdns-57.net.
adityabirla.com. 5 NS ns-1645.awsdns-13.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0