Apex domains cannot have CNAME records.
Question and response
Question
dig silkroadtech.com. NS
Answer
silkroadtech.com. 5 NS ns-882.awsdns-46.net.
silkroadtech.com. 5 NS ns-1930.awsdns-49.co.uk.
silkroadtech.com. 5 NS ns-128.awsdns-16.com.
silkroadtech.com. 5 NS ns-1473.awsdns-56.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0