Apex domains cannot have CNAME records.
Question and response
Question
dig maruzex.com. NS
Answer
maruzex.com. 5 NS ns-1843.awsdns-38.co.uk.
maruzex.com. 5 NS ns-499.awsdns-62.com.
maruzex.com. 5 NS ns-323.awsdns-40.com.
maruzex.com. 5 NS ns-845.awsdns-41.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0