Apex domains cannot have CNAME records.
Question and response
Question
dig rpsassociates.com. NS
Answer
rpsassociates.com. 5 NS ns-1187.awsdns-20.org.
rpsassociates.com. 5 NS ns-771.awsdns-32.net.
rpsassociates.com. 5 NS ns-778.awsdns-33.net.
rpsassociates.com. 5 NS ns-816.awsdns-38.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0