Apex domains cannot have CNAME records.
Question and response
Question
dig algartech.com. NS
Answer
algartech.com. 5 NS ns-429.awsdns-53.com.
algartech.com. 5 NS ns-1125.awsdns-12.org.
algartech.com. 5 NS ns-783.awsdns-33.net.
algartech.com. 5 NS ns-1782.awsdns-30.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0