Apex domains cannot have CNAME records.
Question and response
Question
dig hrdownloads.com. NS
Answer
hrdownloads.com. 5 NS ns-732.awsdns-27.net.
hrdownloads.com. 5 NS ns-1500.awsdns-59.org.
hrdownloads.com. 5 NS ns-1978.awsdns-55.co.uk.
hrdownloads.com. 5 NS ns-299.awsdns-37.com.
Authority
The response has no authority records.
Additional
ns-299.awsdns-37.com. 1 AAAA 2600:9000:5301:2b00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0