Apex domains cannot have CNAME records.
Question and response
Question
dig worldmarketingconcepts.com. NS
Answer
worldmarketingconcepts.com. 5 NS ns-1779.awsdns-30.co.uk.
worldmarketingconcepts.com. 5 NS ns-463.awsdns-57.com.
worldmarketingconcepts.com. 5 NS ns-1050.awsdns-03.org.
worldmarketingconcepts.com. 5 NS ns-1910.awsdns-46.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0