Apex domains cannot have CNAME records.
Question and response
Question
dig blcart.com. NS
Answer
blcart.com. 5 NS ns-624.awsdns-14.net.
blcart.com. 5 NS ns-1364.awsdns-42.org.
blcart.com. 5 NS ns-1775.awsdns-29.co.uk.
blcart.com. 5 NS ns-485.awsdns-60.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0