Apex domains cannot have CNAME records.
Question and response
Question
dig exactbid.com. NS
Answer
exactbid.com. 5 NS ns-1437.awsdns-51.org.
exactbid.com. 5 NS ns-885.awsdns-46.net.
exactbid.com. 5 NS ns-210.awsdns-26.com.
exactbid.com. 5 NS ns-1979.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0